using System;
public class Program
{
public static void Main()
int hours=int.Parse(Console.ReadLine());
int minutes=int.Parse(Console.ReadLine());
minutes+=hours*60+15;
hours=minutes/60;
minutes=minutes%60;
if (hours==24)
Console.WriteLine($"{0}:{minutes:d2}");
}
else
Console.WriteLine($"{hours}:{minutes:d2}");