import time
hours = int(input("how many hours? "))
minutes = int(input("how many minutes? "))
seconds = int(input("how many seconds? "))
while hours > 0 or minutes > 0 or seconds > 0:
    print(hours, ":", minutes, ":", seconds)
    time.sleep(1)
    if seconds == 0:
        seconds = 60
        minutes -= 1
    if minutes == -1:
        minutes = 59
        hours -= 1
    seconds -= 1
while 0 == 0:
    print("TIMER DONE")