input: Write a python function to convert a given number of seconds into hours, minutes, and seconds.
  assert convert_seconds(8 * 3600 + 11 * 60 + 15) == (8, 11, 15)
  assert convert_seconds(3600) == (1, 0, 0)
  assert convert_seconds(3661) == (1, 1, 1)
output: def convert_seconds(seconds):
      hours = seconds // 3600
      minutes = (seconds % 3600) // 60
      seconds = seconds % 60
      return hours, minutes, seconds