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

namespace CP
{
    class Atria
    {
        static void Main(string[] args)
        {
            long[] s = ReadLine().Split(' ').Select(long.Parse).ToArray();
            int ans = 0;
            for (int i = 1; i <= 3; i++)
            {
                if (s[(i * 2) - 2] % 2 == 1)
                {
                    ans++;
                }
                else
                {
                    if (s[(i*2)-2] % 2 == 0)
                    {
                        ans += 2;
                    }
                    else ans++;
                }
            }
            WriteLine(ans % 2 == 0 ? ":-)" : ":-(");
        }

    }
}