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

namespace sum_Second
{
    class Program
    {
        static void Main(string[] args)
        {
            var racer1 = double.Parse(Console.ReadLine());
            var racer2 = double.Parse(Console.ReadLine());
            var racer3 = double.Parse(Console.ReadLine());

            var sum = racer1 + racer2 + racer3;


            if (sum > 0 && sum <=59)
            {
                Console.WriteLine("0" + ":" +  sum);
            }
            else if  (sum >= 60 && sum<=119)
            {

                Console.WriteLine("1" + ":" + (sum - 60));
            }
            else if (sum >= 120 && sum <= 179)
            {

                Console.WriteLine("2" + ":"+ (sum - 120));
            }


        }
    }
}