package yukicoder;

import java.util.Scanner;

public class Q485 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		char[] S = sc.next().toCharArray();
		for (int i = 0; i + 2 < S.length; ++i) {
			if (S[i] == S[i + 1] && S[i + 1] == S[i + 2]) {
				if (S[i] == 'O') {
					System.out.println("East");
				} else {
					System.out.println("West");
				}
				return;
			}
		}
		System.out.println("NA");
	}

}