TimePlus15

import java.util.Scanner;

public class Timepluse15minutes
{
    public static void main(String[] args)
    {
        Scanner scanner = new Scanner(System.in);
        int hours = Integer.parseInt(scanner.nextLine());
        int minutes = Integer.parseInt(scanner.nextLine());
        int results =(hours*60 + (minutes+15));
        minutes = results%60;
        hours = results/60;
        if (hours ==24 && minutes<10)
        {
            System.out.printf("0:0%d",minutes);
        }
        else if (hours == 24)
        {
            System.out.printf("0:%d",minutes);
        }
        else if (minutes <10)
        {
            System.out.printf("%d:0%d",hours,minutes);
        }
        else
        {
            System.out.printf("%d:%d",hours,minutes);
        }
    }
}