using System;
using System.Linq;
using System.IO;
using System.Collections.Generic;
class Solution {
    public void solve(TextReader input, TextWriter output) {
        DateTime dt = DateTime.Parse(input.ReadLine());
        output.WriteLine(dt.AddMinutes(5).ToString("hh:mm"));
    }
}

class CaideConstants {
    public const string InputFile = null;
    public const string OutputFile = null;
}
public class Program {
    public static void Main(string[] args) {
        Solution solution = new Solution();
        using (System.IO.TextReader input =
                CaideConstants.InputFile == null ? System.Console.In :
                        new System.IO.StreamReader(CaideConstants.InputFile))
        using (System.IO.TextWriter output =
                CaideConstants.OutputFile == null ? System.Console.Out:
                        new System.IO.StreamWriter(CaideConstants.OutputFile))

            solution.solve(input, output);
    }
}