diff --git a/TaskC03/run.py b/TaskC03/run.py
new file mode 100644
index 0000000..1babf95
--- /dev/null
+++ b/TaskC03/run.py
@@ -0,0 +1,139 @@
+import sys
+import csv
+from tokenize import Comment
+
+from numpy import append
+
+DEBUG = False
+alfabet = "abc"
+
+sys.setrecursionlimit(4100)
+
+
+def print_debug(*args, **kwargs):
+    if DEBUG:
+        print(*args, **kwargs)
+
+
+if len(sys.argv) == 1:
+    print("Default arguments parsed\n")
+    sys.argv.append("test.arg")
+    sys.argv.append("test.in")
+    sys.argv.append("test.exp")
+
+with open(sys.argv[1], mode="r", newline="", encoding="utf8") as csvfile:
+    filereader = csv.reader(csvfile, delimiter="\t", quotechar="|")
+    fsa_description = list(filereader)
+
+    # skip first line with comment
+    if fsa_description[0][0][0] == "#":
+        fsa_description = fsa_description[1:]
+
+    # get accepting states
+    accepting_state = []
+    for item in reversed(fsa_description):
+        if len(item) == 1:
+            accepting_state.append(item[0])
+        else:
+            break
+
+    fsa_description = fsa_description[: -len(accepting_state)]
+
+    fsa_description_map = {}
+    is_error = False
+    for num, item in enumerate(fsa_description):
+        for letter in item[2]:
+            if letter not in alfabet:
+                print_debug(
+                    "WARNING - letter not in alfabet: ", letter, "| line:", num + 1
+                )
+            tuple = (item[0], letter)
+            if (item[0], letter) in fsa_description_map:
+                print_debug(
+                    f"WARNING - duplicate letter: key = ({item[0]} | {letter}) | line: {num + 1}"
+                )
+            # append to description map or create it if it doesn't exist
+            fsa_description_map[tuple] = fsa_description_map.get(tuple, []) + [item[1]]
+
+    if is_error:
+        exit(-1)
+
+states = {}
+for item in fsa_description_map:
+    states[item[0]] = states[item[0]] + item[1] if item[0] in states else item[1]
+
+
+from collections import Counter
+
+
+# check if all letters are used once
+def is_permutation(str1, str2):
+    return Counter(str1) == Counter(str2)
+
+
+def find_missing_letters(str1, str2) -> str:
+    missing_letters = ""
+    for char in str2:
+        if char not in str1:
+            missing_letters += char
+    return missing_letters
+
+
+for state in states:
+    if not is_permutation(states[state], alfabet):
+        print_debug(
+            f"WARNING - state {state} doesn't match full alphabet: {states[state]} | {alfabet} | diff - {find_missing_letters(states[state], alfabet)}"
+        )
+        # exit(-1)
+
+
+with open(sys.argv[2], mode="r", newline="", encoding="utf8") as file:
+    content = file.read()
+    test_in = content.splitlines()
+
+with open(sys.argv[3], mode="r", newline="", encoding="utf8") as file:
+    content = file.read()
+    test_out = content.splitlines()
+
+
+def is_correct(current_state: str) -> bool:
+    if current_state in accepting_state:
+        return True
+    return False
+
+
+def traverse_states(current_state: str, word: str) -> str:
+    for letter in word:
+        if (current_state, letter) in fsa_description_map:
+            next_states = fsa_description_map[(current_state, letter)]
+            for next_state in next_states:
+                ending_state = traverse_states(next_state, word[1:])
+                if is_correct(ending_state):
+                    return ending_state  # found a correct state
+            return "-2"  # no correct state found
+        else:
+            return "-1"  # unspecified next state
+    return current_state  # end of the word
+
+
+is_difference = []
+for i, word in enumerate(test_in):
+    current_state = "0"
+    if len(word) != 0:
+        current_state = traverse_states(current_state, word)
+
+    print(str(i + 1) + "\t", end="")
+    if current_state in accepting_state:
+        print("YES\t", end="")
+        if "YES" != test_out[i]:
+            print("ERROR", word, end="")
+            is_difference.append(i + 1)
+    else:
+        print("NO\t", end="")
+        if "NO" != test_out[i]:
+            print("ERROR", word, end="")
+            is_difference.append(i + 1)
+    print()
+
+if len(is_difference) != 0:
+    print(is_difference)
diff --git a/TaskC03/test.arg b/TaskC03/test.arg
new file mode 100644
index 0000000..68cabbd
--- /dev/null
+++ b/TaskC03/test.arg
@@ -0,0 +1,6 @@
+0	0	abc
+0	1	a
+1	2	b
+2	3	c
+3	3	abc
+3
\ No newline at end of file