Fixed syntax

app.py

@@ -21,9 +21,9 @@ def my_calculator(arg1:int, arg2:int, op:str)-> int: #it's import to specify the
             return arg1 * arg2
         case "/":
             return arg1 / arg2
-        case "+"
+        case "+":
             return arg1 + arg2
-        case "-"
+        case "-":
             return arg1 - arg2
         case _:
             return 0