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

namespace programPractice
{
    class Program
    {
        static void Main(string[] args)
        {
                string marubatsu = Console.ReadLine();

                int w = marubatsu.IndexOf("XXX");
                int e = marubatsu.IndexOf("OOO");

                if (w == e)
                {
                    Console.WriteLine("NA");
                }
                else if (w < e)
                {
                    Console.WriteLine("West");
                }
                else
                {
                    Console.WriteLine("East");
                }
            
        }
    }
}