@staticmethod
def b():
    n = int(sys.stdin.readline().rstrip())
    (h, n) = divmod(n, 3600)
    (m, s) = divmod(n, 60)
    print(f'{h:02}:{m:02}:{s:02}')
@staticmethod
def b():
    n = int(sys.stdin.readline().rstrip())
    (h, n) = divmod(n, 3600)
    (m, s) = divmod(n, 60)
    print(f'{h:02}:{m:02}:{s:02}')