text: class Solution:
      # log
      def helper(x):
          return int(math.log10(x) + 1) % 2 == 0
  
      # string
      def helper(x):
          return len(str(x)) % 2 == 0
  
      def findNumbers(self, nums: List[int]) -> int:
          return sum(Solution.helper(x) for x in nums)
  