import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		int east = 0; int west = 0;
		for(int i = 0 ; i < s.length() ; i++) {
			if(s.charAt(i) == 'O') {
				east++;
				west = 0;
				if(east == 3) {
					System.out.println("East");
					return;
				}
			} else {
				west++;
				east = 0;
				if(west == 3) {
					System.out.println("West");
					return;
				}
			}
		}
		System.out.println("NA");
	}
}