diff --git a/TaskA01/run.py b/TaskA01/run.py
new file mode 100644
index 0000000..c4f3f22
--- /dev/null
+++ b/TaskA01/run.py
@@ -0,0 +1,20 @@
+def contains_word(to_be_checked: str, word: str) -> bool:
+    word_len: int = len(word)
+    word_character_number: int = 0
+    for c in to_be_checked:
+        if c != word[word_character_number]:
+            word_character_number = 0
+            continue
+        if word_character_number == word_len - 1:
+            return True
+        word_character_number += 1
+    return False
+
+file = open('shakespeare.exp', 'r', encoding='utf8')
+result = []
+line_number = 0
+for line in file:
+    if contains_word(line, 'Hamlet'):
+        result.append(line_number)
+    line_number += 1
+print(result)
\ No newline at end of file
diff --git a/TaskA02/run.py b/TaskA02/run.py
new file mode 100644
index 0000000..04c5240
--- /dev/null
+++ b/TaskA02/run.py
@@ -0,0 +1,62 @@
+class Machine:
+    _state: int = 0
+
+    def consume_character(self, char: str) -> None:
+        if self._state == 0:
+            if char == 'P' or char == 'p':
+                self._state = 1
+            else:
+                self._state = 6
+        elif self._state == 1:
+            if char == 'I' or char == 'i':
+                self._state = 2
+            else:
+                self._state = 6
+        elif self._state == 2:
+            if char == 'E' or char == 'e':
+                self._state = 3
+            else:
+                self._state = 6
+        elif self._state == 3:
+            if char == 'S' or char == 's':
+                self._state = 4
+            else:
+                self._state = 6
+        elif self._state == 4:
+            if char == '\n' or char == ' ' or char == '\t' or char == '\r':
+                self._state = 5
+            else:
+                self._state = 6
+        elif self._state == 6:
+             if char == ' ' or char == '\t':
+                self._state = 0
+
+    def is_success_state(self) -> bool:
+        return self._state == 5
+    
+    def restart(self) -> None:
+        self._state = 0
+
+def find_lines_with_pies(text: str) -> list[int]:
+    output: list[int] = []
+    line_number = 0
+    machine = Machine()
+    for char in text:
+        machine.consume_character(char)
+        if char == '\n':
+            if machine.is_success_state():
+                output.append(line_number)
+            machine.restart()
+            line_number += 1
+    if machine.is_success_state():
+        output.append(line_number)
+    line_number += 1
+    return output
+
+
+text: str = None
+with open('polish_wiki_excerpt.exp', 'r', encoding='utf8') as file:
+    text = file.read()
+
+result = find_lines_with_pies(text)
+print(result)
\ No newline at end of file
diff --git a/TaskA03/run.py b/TaskA03/run.py
new file mode 100644
index 0000000..ff21ae1
--- /dev/null
+++ b/TaskA03/run.py
@@ -0,0 +1,70 @@
+class Machine:
+    _state: int = 0
+
+    def consume_character(self, char: str) -> None:
+        if self._state == 0:
+            if char == '1':
+                self._state = 1
+            else:
+                self._state = 0
+        elif self._state == 1:
+            if char == '9':
+                self._state = 2
+            else:
+                self._state = 0
+        elif self._state == 2:
+            if char == '1' or char == '2' or char == '3' or char == '4' or char == '5' or char == '6' or char == '7' or char == '8' or char == '9':
+                self._state = 3
+            else:
+                self._state = 0
+        elif self._state == 3:
+            if char == '1' or char == '2' or char == '3' or char == '4' or char == '5' or char == '6' or char == '7' or char == '8' or char == '9':
+                self._state = 4
+            else:
+                self._state = 0
+        elif self._state == 4:
+            if char == ' ':
+                self._state = 5
+            else:
+                self._state = 0
+        elif self._state == 5:
+             if char == 'r':
+                self._state = 6
+             else:
+                self._state = 0
+        elif self._state == 6:
+             if char == '.':
+                self._state = 7
+             else:
+                self._state = 0
+
+
+    def is_success_state(self) -> bool:
+        return self._state == 7
+    
+    def restart(self) -> None:
+        self._state = 0
+
+def find_lines_with_date(text: str) -> list[int]:
+    output: list[int] = []
+    line_number = 0
+    machine = Machine()
+    for char in text:
+        machine.consume_character(char)
+        if char == '\n':
+            if machine.is_success_state():
+                output.append(line_number)
+            machine.restart()
+            line_number += 1
+    if machine.is_success_state():
+        output.append(line_number)
+    line_number += 1
+    return output
+
+
+text: str = None
+with open('polish_wiki_excerpt.exp', 'r', encoding='utf8') as file:
+    text = file.read()
+
+result = find_lines_with_date(text)
+print(result)
\ No newline at end of file
diff --git a/TaskA04/run.py b/TaskA04/run.py
new file mode 100644
index 0000000..63c6dd3
--- /dev/null
+++ b/TaskA04/run.py
@@ -0,0 +1,51 @@
+class Machine:
+    _state: int = 0
+    _current_digital_substring: str = ''
+    _results: list[str] = []
+
+    def consume_character(self, char: str) -> None:
+        if self._state == 0:
+            if self._is_digit(char):
+                self._state = 1
+                self._current_digital_substring += char 
+            elif not self._is_separator(char):
+                self.state = 2
+        elif self._state == 1:
+            if self._is_digit(char):
+                self._current_digital_substring += char 
+            elif not self._is_separator(char):
+                self.state = 2
+                self._current_digital_substring = ''
+            else:
+                self.finish()
+        elif self._state == 2:
+            if self._is_separator(char):
+                self.state = 0
+
+    def _is_separator(self, char) -> bool:
+        return char == '\n' or char == ' ' or char == '\t'
+
+    def _is_digit(self, char: str) -> bool:
+        return char == '1' or char == '2' or char == '3' or char == '4' or char == '5' or char == '6' or char == '7' or char == '8' or char == '9'
+
+    def finish(self) -> None:
+        if self._current_digital_substring != '':
+            self._results.append(self._current_digital_substring)
+        self._current_digital_substring = ''
+        self._state = 0
+
+    def get_results(self) -> list[int]:
+        return self._results
+
+
+
+text: str = None
+with open('simple.exp', 'r', encoding='utf8') as file:
+    text = file.read()
+
+machine = Machine()
+for c in text:
+    machine.consume_character(c)
+machine.finish()
+
+print(machine.get_results())
\ No newline at end of file