TimePlus

import java.util.Scanner;

public class TimePlus15Minutes01 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int hour = Integer.parseInt(scanner.nextLine());
        int minutes = Integer.parseInt(scanner.nextLine());

        int allMinutesPlus15 = ((hour*60)+minutes)+15;
        int hourPlus = allMinutesPlus15/60;
        int minutesPlus = allMinutesPlus15%60;

        if (hourPlus>=24) {
            hourPlus=hourPlus-24;
        }

        System.out.printf("%d:%02d", hourPlus, minutesPlus);
    }
}