using System;
using System.Linq;

class Program
{
	static void Main()
	{
		var T = Console.ReadLine().Split(':').Select(int.Parse);
		int hour = T.First(), minute = T.Last();
		int time = hour * 60 + minute;
		time += 5;
		Console.WriteLine($"{((time / 60) % 24) :00}:{(time % 60) :00}");
	}
}