05. Time + 15 Minutes

import java.util.Scanner;

public class Time15Minutes {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int A = Integer.parseInt(scanner.nextLine());
        int B = Integer.parseInt(scanner.nextLine());

        int C = A*60+B;
        int D = C+15;

        int E = D/60;
        int F = D%60;

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

        System.out.printf("%d:%02d", E , F );

    }
}