using System;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static void Main(string[] args)
    {
        string s = Console.ReadLine();
        string ans = "NA";

        if (s.Contains("OOO"))
        {
            ans = "East";
        }
        else if (s.Contains("XXX"))
        {
            ans = "West";
        }

        Console.WriteLine(ans);
        Console.Read();
    }
}