input: 
  from typing import List, Union
  
  def to_int_list(s: str, delimiter: str = ',') -> List[int]:
      """
      Convert a given string to a list of integers using the specified delimiter.
  
      >>> to_int_list("1,2,3,4,5")
      [1, 2, 3, 4, 5]
      >>> to_int_list("10;20;30", delimiter=";")
      [10, 20, 30]
      """
      return [int(x) for x in s.split(delimiter)]
  
output:     return [int(x) for x in s.split(delimiter)]