diff --git a/Lab9.py b/Lab9.py
index b54a4b4..c71d808 100644
--- a/Lab9.py
+++ b/Lab9.py
@@ -8,7 +8,14 @@ def encoder(password):
     return new_password
 
 def decoder(password):
-    pass
+    temp_string = ""
+    for char in password:
+        char = int(char)-3
+        if char < 0:
+            char = char+10
+        char = str(char)
+        temp_string += char
+    return temp_string
 
 if __name__ == "__main__":
     password = None
@@ -27,4 +34,4 @@ def decoder(password):
         elif option == 2:
             print(f"The encoded password is {password}, and the original password is {decoder(password)}.")
         elif option == 3:
-            break
\ No newline at end of file
+            break