/*
    1:20    100    结果应该为:3:00下面验算:
    小时:hour = (hour + (20 +100) / 60 ) % 24
    %24的原因是:题目要求只考虑时和分,不考虑日期
    分钟:minute = (20+100) % 60 = 0
    */

import java.util.Scanner;
public class Main {
    
    public static void main(String[] args) {
        
        Scanner sc = new Scanner(System.in);
        String str = sc.next();    // 记录hour:minute
        int k = sc.nextInt();      // 记录k分钟
        int index = 0;    // 记录字符串中:的位置
        for(int i = 0 ; i < str.length() ; i++) {
            if(str.charAt(i) == ':') {
                index = i;
                break;
            }
        }
        int hour = Integer.parseInt(str.substring(0,index));    // hour
        int minute = Integer.parseInt(str.substring(index + 1, str.length()));    // minute 
        hour = (hour + (k + minute) / 60 ) % 24;
        minute = (k % 60 + minute) % 60;

        System.out.println(String.format("%02d", hour) + ":" + String.format("%02d", minute));
    }
}