03. 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 minute = Integer.parseInt(scanner.nextLine());

        int totalMinutes = hour * 60 + minute + 15;
        int hours = totalMinutes / 60 % 24;
        int minutes = totalMinutes % 60;

        System.out.printf("%d:%02d", hours, minutes);
    }
}