using System;
    using System.Linq;
    using System.Collections.Generic;
    using System.Text.RegularExpressions;
    using System.Text;
     
    public class Program
    {
        public void Proc() {
            Reader.IsDebug = false;
            string inpt = Reader.ReadLine();
            for(int i=0; i<=inpt.Length-3;i++) {
                string sample = inpt.Substring(i, 3);
                if(sample.Equals("OOO")) {
                    Console.WriteLine("East");
                    return;
                } else if(sample.Equals("XXX")) {
                    Console.WriteLine("West");
                    return;
                }
            }
            Console.WriteLine("NA");
        }

        public class Reader {
            public static bool IsDebug = true;
            private static System.IO.StringReader SReader;
            private static string InitText = @"


OXOOXXX



";
            public static string ReadLine() {
                if(IsDebug) {
                    if(SReader == null) {
                        SReader = new System.IO.StringReader(InitText.Trim());
                    }
                    return SReader.ReadLine();
                } else {
                    return Console.ReadLine();
                }
            }
        }
        public static void Main(string[] args)
        {
            Program prg = new Program();
            prg.Proc();
        }
    }