input: def add_marks(marks: List[int], mark: int) -> List[int]:
      """Adds a given mark to each value in a list of marks.
      >>> add_marks([87, 56, 99, 54], 4)
      [91, 60, 103, 58]
      >>> add_marks([10, 20, 30], 5)
      [15, 25, 35]
      """
      return [m + mark for m in marks]
output:     return [m + mark for m in marks]