Update app.py

app.py

@@ -232,7 +232,7 @@ def replace_words(sentence):
         (r'\bthiri\b', 'three'), (r'\btiri\b', 'three'), (r'\bdubalathri\b', 'double three'),(r'\btin\b', 'three'), 
         (r'\bfor\b', 'four'),(r'\bfore\b', 'four'), 
         (r'\bfib\b', 'five'),(r'\bpaanch\b', 'five'), 
-        (r'\bchha\b', 'six'),(r'\bchhah\b', 'six'),
+        (r'\bchha\b', 'six'),(r'\bchhah\b', 'six'),(r'\bchau\b', 'six'),
         (r'\bdublseven\b', 'double seven'),(r'\bsath\b', 'seven'),
         (r'\baath\b', 'eight'),
         (r'\bnau\b', 'nine'),