题解 | #小乐乐定闹钟#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String hm = in.next(); //hour:minute
        int k = in.nextInt(); //k:minute
        String hms[] = hm.split(":");
        int hours = Integer.parseInt(hms[0]) + k / 60;
        int mimute = Integer.parseInt(hms[1]) + k % 60;

        if (mimute >= 60) {
            mimute = mimute%59-1;
            hours=hours+1;
        }
        if (hours >24) {
            hours = hours%24;
        }
         

        System.out.println((hours < 10 ? "0" + hours : hours) + ":" +
                           (mimute < 10 ? "0" + mimute : mimute));
    }
}