using System;

class Program
{
    const char WIN  = 'O';
    const char LOSE = 'X';
    const string E = "East";
    const string W = "West";
    const string N = "NA";
    static void Main(string[] args)
    {
        var input = Console.ReadLine().ToCharArray();

        for (int i=0; i < input.Length - 2; i++)
        {
            if (input[i] == WIN && input[i+1] == WIN && input[i+2] == WIN)
            {
                Console.WriteLine(E);
                return;
            }
            else if (input[i] == LOSE && input[i + 1] == LOSE && input[i + 2] == LOSE)
            {
                Console.WriteLine(W);
                return;
            }
        }
        Console.WriteLine(N);
    }
}