fix: int arg shoudl fit fairytale length

app.py

@@ -27,8 +27,9 @@ def my_fairytale_tool(arg:int)-> str: #it's import to specify the return type
     ]
     
     # Randomly select  fairytales from the list
-    selected_1 = fairytales[int(arg // len(fairytales))]
-    fairytales.pop(int(arg // len(fairytales)))
+    normalize_to_fairytales_range = int(arg) // len(fairytales)
+    selected_1 = fairytales[normalize_to_fairytales_range]
+    fairytales.pop(int(arg) // len(fairytales)
     selected_2 = fairytales[random.randint(0,len(fairytales)-1)]
 
     return f"Title to draw: What a crazy idea to see a story of {selected_1} vs {selected_2}!"