javaTime

import java.util.Scanner;

public class TimePlus15Minutes {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

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

        minutes = minutes +15;

        if (minutes > 59) {
           minutes -= 60;
           hours ++;
        }else if (hours >= 24) {
            hours = 0;
        }if (minutes < 10) {
            System.out.println(hours + ":0" + minutes);
        }else {
            System.out.println(hours + ":" + minutes);
        }






    }
}