new_contents: class Solution:
      # @param {string} s
      # @param {string} t
      # @return {boolean}
      def isAnagram(self, s, t):
          if len(s) != len(t):
              return False
          chs = {}
          for ch in s:
              chs[ch] = chs.get(ch, 0) + 1
          for ch in t:
              if ch not in chs or chs[ch] == 0:
                  return False
              chs[ch] -= 1
          return True
  
subject: Rename ValAnagram_003.py to ValAnagram_004.py