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

namespace _7_ma
{
    class Program
    {
        static void Main(string[] args)
        {

            var m = double.Parse(Console.ReadLine());
            var n = double.Parse(Console.ReadLine());
            var p = double.Parse(Console.ReadLine());


            var secs = m + n + p;
            var mins = 0;

            if (secs >= 59)
            {
                if (secs >= 10)
                {
                    Console.WriteLine($"0:{secs}");
                }

                else {
                    Console.WriteLine($"0:0{secs}");

                }


            }
            else if (secs >= 60 && secs <= 119)
            {
                if (secs - 60 >= 10)
                {
                    Console.WriteLine($"1:{secs - 60 }");
                }

                else {
                    Console.WriteLine($"1:0{secs - 60} ");


                }



            }


            else if (secs >= 120 && secs <= 179)
            {
                if (secs - 120 >=10)
                {
                    Console.WriteLine($"2:{secs -120}");
                }

                else
                {
                    Console.WriteLine($"2:0{secs - 120}");
                }
            }



        }
    }
}