Update app.py

app.py

@@ -113,6 +113,8 @@ class CountNumberLetter(BaseModel):
 def count_number_letters(obj):
   letter = obj.letter.lower()
   expression = obj.word.lower()
+  if letter == "None":
+    return f"There are {len(obj.word)} letters in '{expression}'"
   count = len([l for l in expression if l == letter])
   if count == 1:
     return f"There is 1 '{letter}' in '{expression}'"