diff --git a/TaskD00/D00.py b/TaskD00/D00.py
new file mode 100644
index 0000000..0c80ee8
--- /dev/null
+++ b/TaskD00/D00.py
@@ -0,0 +1,28 @@
+import re
+import sys
+
+
+def substitute_numbers(string):
+    result = ''
+    subs = {
+        '0': 'a',
+        '1': 'b',
+        '2': 'c',
+        '3': 'd',
+        '4': 'e',
+        '5': 'f',
+        '6': 'g',
+        '7': 'h',
+        '8': 'i',
+        '9': 'j'
+    }
+    for char in string:
+        result += subs[char]
+    return result
+
+
+regex = r"[0-9]{4}"
+
+for line in sys.stdin:
+    line = re.sub(regex, lambda m: substitute_numbers(m.group()), line)
+    print(line.rstrip('\n'))
diff --git a/TaskD00/Makefile b/TaskD00/Makefile
new file mode 100644
index 0000000..e69de29
diff --git a/TaskD00/run b/TaskD00/run
new file mode 100755
index 0000000..32df26b
--- /dev/null
+++ b/TaskD00/run
@@ -0,0 +1,2 @@
+#!/bin/bash
+python3 TaskD00/D00.py "$@"
\ No newline at end of file
diff --git a/result.csv b/result.csv
index 40d583c..6982ce6 100644
--- a/result.csv
+++ b/result.csv
@@ -1,2 +1,2 @@
 POINTS
-13
+25