from machine import Pin, Timer
import time

class Clock:
    def __init__(self, hours, minutes, seconds):
        self.hours = hours
        self.minutes = minutes
        self.seconds = seconds

    def addSecond(self):
        if self.seconds == 59:
            self.seconds = 0
            self.minutes = self.minutes + 1
        else:
            self.seconds = self.seconds + 1

        if self.minutes == 60:
            self.minutes = 0
            self.hours = self.hours + 1

        if self.hours == 24:
            self.hours = 0

h = int(input('HH: '))
m = int(input('MM: '))
s = int(input('SS: '))

clock = Clock(h, m, s)

tim = Timer(-1)
tim.init(period=1000, mode=Timer.PERIODIC, callback=lambda t:clock.addSecond())

while(1):
    
   print('%02d:%02d:%02d' % (clock.hours, clock.minutes, clock.seconds))
   time.sleep_ms(1000)