using System;

namespace Time_Plus_15Min
{
	class MainClass
	{
		public static void Main (string[] args)
		{
			var hour = int.Parse(Console.ReadLine());
			var minutes = int.Parse(Console.ReadLine());
			minutes = minutes + 15;
			if ( minutes >= 60 ) {
				hour = hour + 1 ;
				minutes = minutes - 60;

				if   (hour >= 24)
					hour = hour - 24;

			}
			Console.WriteLine("{0}:{01:00}", hour, minutes );

		}
	}
}