using System;
public class Hello{
 
 
    public static void Main(){
        //まずはスペースで区切る
        string[] Text = Console.ReadLine().Split(' ');
        int later = int.Parse(Text[1]);
 
        //次に:で区切る
        string[] Time = Text[0].Split(':');
        int Hour = int.Parse(Time[0]);
        int Minitue = int.Parse(Time[1]);
 
        //上限下限設定
        if(later < 1)
        {
            later = 1;
        }
        else if(later > 300)
        {
            later = 300;
        }
        //時間の方の上限は繰り上げ時にまとめて行う
        if(Hour < 0)
        {
            Hour = 0;
        }
        if(Minitue <0)
        {
            Minitue =0;
        }
        //計算…
        Minitue += later;
        //繰り上げ処理 先に分から計算する
        if(Minitue >= 60)
        {
            Hour += (int)Minitue/60;
            Minitue -= (int)Minitue/60 * 60;
        }
        if(Hour >= 24)
        {
            Hour -= (int)Hour/24 * 24;
        }
 
        //文字列に変換し、値が小さいときは先頭に0をつける
        string hh = "";
        string mm = "";
 
        if(Hour < 10)
        {
            hh = "0" +　Hour.ToString();
        }
        else
        {
            hh = Hour.ToString();
        }
 
        if(Minitue < 10)
        {
            mm = "0" +　Minitue.ToString();
        }
        else
        {
            mm = Minitue.ToString();
        }
 
        Console.WriteLine(Text[0] + "の" + later + "分後は" +hh + ":" + mm + "です。");
    }
}
 

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