import java.util.Scanner;

public class Yukicoder486 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        int e = 0, w = 0;
        for (int i = 0; i < s.length(); i++) {
            if (s.charAt(i) == 'O') {
                e++;
                w = 0;
            } else {
                w++;
                e = 0;
            }
            if (e == 3) {
                System.out.println("East");
                return;
            } else if (w == 3) {
                System.out.println("West");
                return;
            }
        }
        System.out.println("NA");

    }
}