using System;
using System.Collections.Generic;
using System.Linq;
    class Program
    {
        const string WIN = "OOO";
        const string LOSE = "XXX";
        const string E = "East";
        const string W = "West";
        const string N = "NA";
        static void Main(string[] args)
        {
            var line = Console.ReadLine();           
            if (line.Contains(WIN)) Console.WriteLine(E);
            else if (line.Contains(LOSE)) Console.WriteLine(W);
            else Console.WriteLine(N);
        }
    }