old_contents: """Leetcode 58. Length of Last Word
  Easy
  
  URL: https://leetcode.com/problems/length-of-last-word/
  
  Given a string s consists of upper/lower-case alphabets and empty space
  characters ' ', return the length of last word in the string.
  
  If the last word does not exist, return 0.
  
  Note: A word is defined as a character sequence consists of non-space
  characters only.
  
  Example:
  Input: "Hello World"
  Output: 5
  """
  
  class SolutionSplit(object):
      def lengthOfLastWord(self, s):
          """
          :type s: str
          :rtype: int
  
          Time complexity: O(n).
          Space complexity: O(n).
          """
          if not s:
              return 0
  
          # Strip and then split s with separator ' '.
          splitted_s = s.strip().split(' ')
  
          # Return last word's length.
          return len(splitted_s[-1])
  
  
  def main():
      # Output: 5
      s = "Hello World"
      print SolutionSplit().lengthOfLastWord(s)
  
  
  if __name__ == '__main__':
      main()
  
new_contents: """Leetcode 58. Length of Last Word
  Easy
  
  URL: https://leetcode.com/problems/length-of-last-word/
  
  Given a string s consists of upper/lower-case alphabets and empty space
  characters ' ', return the length of last word in the string.
  
  If the last word does not exist, return 0.
  
  Note: A word is defined as a character sequence consists of non-space
  characters only.
  
  Example:
  Input: "Hello World"
  Output: 5
  """
  
  class SolutionStripSplit(object):
      def lengthOfLastWord(self, s):
          """
          :type s: str
          :rtype: int
  
          Time complexity: O(n).
          Space complexity: O(n).
          """
          if not s:
              return 0
  
          # Strip and then split s with separator ' '.
          splitted_s = s.strip().split(' ')
  
          # Return last word's length.
          return len(splitted_s[-1])
  
  
  def main():
      # Output: 5
      s = "Hello World"
      print SolutionStripSplit().lengthOfLastWord(s)
  
  
  if __name__ == '__main__':
      main()
  
subject: Rename to SolutionStripSplit class