using System;
using System.Linq;

public class P0486 {
    public static void Main() {
        var s = Console.ReadLine().Trim();
        var e = s.IndexOf("OOO");
        var w = s.IndexOf("XXX");
        e = e < 0 ? s.Length : e;
        w = w < 0 ? s.Length : w;
        if(e < w) {
            Console.WriteLine("East");
        } else if(e > w) {
            Console.WriteLine("West");
        } else {
            Console.WriteLine("NA");
        }
    }
}