using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _1._4_Back_in_30_Minutes
{
    class Program
    {
        static void Main(string[] args)
        {
            // Input --> Sirst line: hours ( 0 - 23 ) - Second line: minutes ( 0 - 59 )
            //Output --> format hh:mm. The hours have one or two numbers and the minutes have always two numbers (with leading zero).

            int hours = int.Parse(Console.ReadLine());
            int minutes = int.Parse(Console.ReadLine());

            minutes += 30;

            if (minutes > 59)
            {
                hours += 1;
                minutes -= 60;
            }
            if ( hours > 23 )
            {
                hours = 0;
            }

            Console.WriteLine($"{hours}:{minutes:D2}");
        }
    }
}