using System;

​

public class Program

{

    public static void Main()

    {

        //11

        int chas = int.Parse(Console.ReadLine());

        //08

        int min = int.Parse(Console.ReadLine());

        min += 15;

        if (min > 59){

        chas++;

            min -=59;

        }

        Console.WriteLine("{0}:{1}", chas, min);

    }}

​

​