using System;
using System.Linq;

public class P0525 {
    public static void Main() {
        var hm = Console.ReadLine().Trim().Split(':').Select(int.Parse).ToList();
        var result = hm[0] * 60 + hm[1] + 5;
        result %= 1440;
        Console.WriteLine(String.Format("{0,2:00}:{1,2:00}", result / 60, result % 60));
    }
}