package sg20170226;

import java.util.Scanner;

public class No_486 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.nextLine();
		int W = 0;
		int L = 0;
		for (int i = 1; i <= s.length(); i++) {
			String s2 = s.substring(i - 1, i);
			if (s2.equals("O")) {
				W++;
				L = 0;
			} else if (s2.equals("X")) {
				L++;
				W = 0;
			}
		}
		if (W >= 3) {
			System.out.println("East");
		} else if (L >= 3) {
			System.out.println("West");
		} else {
			System.out.println("NA");
		}
	}
}