using System;

public class Hello
{
    public static void Main()
    {
        var s = Console.ReadLine().Trim();
        var o = s.IndexOf("OOO");
        var x = s.IndexOf("XXX");
        Console.WriteLine(check(o,x));
    }
    public static string check (int o , int x)
    {
        if (o == -1 && x == -1) return "NA";
        if (o >= 0 && x == -1) return "East";
        if (o == -1 && x >= 0) return "West";
        if (o < x) return "East";
        else return "West";
    }
}