using System;
using System.Text;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using static System.Console;
using static System.Math;

namespace YukiCoder
{
    public class Program
    {
        public static void Main(string[] args)
        {
            new Program().Solve();
        }

        public void Solve()
        {
            int[] AB = Console.ReadLine().Split().Select(x => int.Parse(x)).ToArray();

            if ((AB[0] + AB[2] + AB[4]) % 2 == 0)
            {
                WriteLine(":-)");
            }
            else
            {
                WriteLine(":-(");
            }
        }
    }
}