message: Update vowels-of-all-substrings.py
diff: @@ -8,4 +8,4 @@ class Solution(object):
  :rtype: int
  """
  VOWELS = set("aeiou")
  - return sum((i+1) * (len(word)-i) for i, c in enumerate(word) if c in VOWELS)
  + return sum((i-0+1) * ((len(word)-1)-i+1) for i, c in enumerate(word) if c in VOWELS)
  