input: def to_int_list(s: str) -> list[int]:
      """Convert a given string of comma-separated integers to a list of integers.
      >>> to_int_list("1,2,3,4")
      [1, 2, 3, 4]
      >>> to_int_list("5,6,7")
      [5, 6, 7]
      """
output:     return [int(x) for x in s.split(',')]