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

namespace yukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            string s = Console.ReadLine();
            for(int i = 0;i < s.Length - 2; i++)
            {
                string x = s.Substring(i, 3);
                if (x == "XXX")
                {
                    Console.WriteLine("West");
                    return;
                }else if(x == "OOO")
                {
                    Console.WriteLine("East");
                    return;
                }
               
            }
            Console.WriteLine("NA");
            Console.ReadLine();
        }




    }
}