Update app.py

app.py

@@ -39,13 +39,13 @@ def convert_to_french_letters(number):
         if hundreds == 1:
             words.append('cent')
         else:
-            words.append(units[hundreds] + ' cent')
+            words.append(units[int(hundreds)] + ' cent')
             
     if tens_and_units > 0:
         if tens_and_units < 10:
-            words.append(units[tens_and_units])
+            words.append(units[int(tens_and_units)])
         elif tens_and_units < 20:
-            words.append('dix-' + units[tens_and_units-10])
+            words.append('dix-' + units[int(tens_and_units-10)])
         else:
             tens_digit = tens[int(tens_and_units / 10)]
             units_digit = units[int(tens_and_units % 10)]