Update app.py

app.py

@@ -18,13 +18,13 @@ def add_if_possible_else_concat(arg1:str, arg2:int)-> str: #it's import to speci
         arg2: the second argument
     """
     def check_int(s):
-    if s[0] in ('-', '+'):
-        return s[1:].isdigit()
-    return s.isdigit()
+        if s[0] in ('-', '+'):
+           return s[1:].isdigit()
+        return s.isdigit()
     final_var = ""
     if check_int(arg1) == True and check_int(arg2) == True: 
        final_var = str(arg1+arg2)
-    else
+    else:
        final_var = str(arg1)+str(arg2)
     return final_var