input: def sum_selected_elements(arr, k):
      """
      Given a non-empty list of integers arr and an integer k, return
      the sum of the elements that have at most two digits from the first k elements of arr.
  
      Example:
  
          Input: arr = [111, 21, 3, 4000, 5, 6, 7, 8, 9], k = 4
          Output: 24 # sum of 21 + 3
  
      Constraints:
          1. 1 <= len(arr) <= 100
          2. 1 <= k <= len(arr)
      """
output:     
      return sum(x for x in arr[:k] if -99 <= x <= 99)
  