public class Main {

public static void main(String[] args) {

java.util.Scanner in = new java.util.Scanner(System.in);

Clock clock = new Clock(in.nextInt(), in.nextInt(), in.nextInt());

clock.tick();

System.out.println(clock);

in.close();

}

}

class Clock {

private Display hour = new Display(24);

private Display minute = new Display(60);

private Display second = new Display(60);

public Clock(int hour, int minute, int second) {

this.hour.startTime(hour);

this.minute.startTime(minute);

this.second.startTime(second);

}

public void tick() {

if (second.increase())

if (minute.increase()) {

hour.increase();

}

}

public String toString() {

return String.format("%02d:%02d:%02d", hour.getValue(), minute.getValue(), second.getValue());

}

}

class Display {

private int value = 0;

private int limit = 0;

public Display(int limit) {

this.limit = limit;

}

public void startTime(int value) {

this.value = value;

}

public boolean increase() {

value++;

if (value == limit) {

value = 0;

return true;

}

return false;

}

public int getValue() {

return value;

}

}