input: Write a function to convert seconds into days, hours, minutes, and seconds.
  assert convertSeconds(86400) == (1, 0, 0, 0)
  assert convertSeconds(90061) == (1, 1, 1, 1)
  assert convertSeconds(3600) == (0, 1, 0, 0)
  assert convertSeconds(59) == (0, 0, 0, 59)
output: def convertSeconds(seconds):
      days = seconds // 86400
      seconds %= 86400
      hours = seconds // 3600
      seconds %= 3600
      minutes = seconds // 60
      seconds %= 60
      return (days, hours, minutes, seconds)