input: 
  def count_x(y: list, x: int) -> int:
      """ Count the number of occurrences of an element x in a list y.
      >>> count_x([3, 5, 2, 7, 4, 3, 2], 2)
      2
      """
      count = 0
      for i in y:
          if i == x:
              count += 1
      return count
  
output:     count = 0
      for i in y:
          if i == x:
              count += 1
      return count