using System;
public class Program
{
public static void Main(string[] args)
var mins = int.Parse(Console.ReadLine());
var hours = int.Parse(Console.ReadLine());
mins = 15 + mins;
if (mins > 59)
mins = mins %60;
}
if (hours > 23)
hours = hours %24;
if (mins < 10)
Console.WriteLine(hours + ":" + "0" + mins);
else
Console.WriteLine(hours + "0" + mins);