input: def add_marks(marks: list[int], mark: int) -> list[int]:
      """ Adds a given mark to each value in the marks list.
      >>> add_marks([87, 56, 99, 54], 4)
      [91, 60, 103, 58]
      >>> add_marks([34, 78, 29], 2)
      [36, 80, 31]
      """
output:     return [x + mark for x in marks]