using System;
public class Program
{
    static void Main()
    {
        string s = Console.ReadLine();

        string ans = "NA";
        for (int i = 0; i < s.Length - 2; i++)
        {
            if (s[i] == s[i + 1] && s[i + 1] == s[i + 2])
            {
                ans = (s[i] == 'O') ? "East" : "West";
                break;
            }
        }
        Console.WriteLine(ans);
    }
}