Time+15 Minutes

import java.util.Scanner;

public class TimePLUS15Minutes {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int hour = Integer.parseInt(scanner.nextLine());
        int min = Integer.parseInt(scanner.nextLine());

        min += 15;

        if (min >= 60) {
            hour +=1;
            min -= 60;
        }
        if (hour >= 24) {
            hour -= 24;
        }
        if (min < 10) {
            System.out.println(hour + ":0" + min);
        }
        else {
            System.out.println(hour + ":" + min);
        }
    }
}