Update app.py

app.py

@@ -51,7 +51,7 @@ def score_fincat(txt):
       if word[-1] in ['.', ',', ';', ":", "-", "!", "?", ")", '"', "'"]:
         k = word[-1]
         word = word[:-1]
-      st = txt.index(" " + word + k + " ")+1
+      st = txt.find(" " + word + k + " ")+1
       k = ''
       ed = st + len(word)
       x = {'paragraph' : txt, 'offset_start':st, 'offset_end':ed}