using System;
using System.Collections.Generic;
using static System.Console;
namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] N = ReadLine().Split(' ');
            int A = int.Parse(N[0]);
            int B = int.Parse(N[2]);
            int C = int.Parse(N[4]);

            if((A + B + C) % 2 == 0)
            {
                WriteLine(":-)");
            }
            else
            {
                WriteLine(":-(");
            }
        }
    }
}