using System;
using System.Collections.Generic;
using System.Linq;


class Solution
{
    static void Main()
    {
        var t = Console.ReadLine();

        var time = TimeSpan.Parse(t + ":00");
        time = time.Add(new TimeSpan(0, 5, 0));

        Console.WriteLine($"{time.Hours:d2}:{time.Minutes:d2}");
    }
}