using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static string[] SList(long n) => Enumerable.Repeat(0, (int)n).Select(_ => ReadLine()).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var s = ReadLine().Split();
        var a = int.Parse(s[0]);
        var b = int.Parse(s[1]);
        var u = s[2];
        var isminus = u[3] == '-';
        var hm = u[4..];
        var h = 0;
        var m = 0;
        if (hm.Contains('.'))
        {
            var t = hm.Split('.');
            h = int.Parse(t[0]);
            m = int.Parse(t[1]) * 6;
        }
        else h = int.Parse(hm);
        if (u[3] == '-')
        {
            h = -h;
            m = -m;
            if (m < 0)
            {
                --h;
                m += 60;
            }
        }
        var lh = a - 9 + h + 48;
        var lm = b + m;
        if (lm >= 60)
        {
            ++lh;
            lm -= 60;
        }
        lh %= 24;
        WriteLine($"{lh:00}:{lm:00}");
    }
}