TimePlus15Minutes

import java.util.Scanner;

public class test {
    public static void main(String[] agrs) {

        Scanner console = new Scanner(System.in);
        int hours = Integer.parseInt(console.nextLine());
        int min = Integer.parseInt(console.nextLine());

        int sum = min + 15;

        if (sum >= 10 && sum < 60) {
            System.out.printf("%d:%d%n", hours, sum);
        } else if (sum >= 60 && hours != 23) {
            hours = hours + 1;
            sum = sum - 60;
            if (sum >= 10) {
                System.out.printf("%d:%d", hours, sum);
            } else System.out.printf("%d:0%d", hours, sum);
        } else if (sum >= 60 && hours == 23) {
            hours = 0;
            sum = sum - 60;
            if (sum >= 10) {
                System.out.printf("%d:%d%n", hours, sum);
            } else System.out.printf("%d:0%d", hours, sum);
        }
    }
}