import java.util.*;

class Main {
        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;
                                if (E >= 3) {
                                        System.out.println("East");
                                        return;
                                }
                        } else {
                                W++;
                                E=0;
                                if (W >= 3) {
                                        System.out.println("West");
                                        return;
                                }
                        }
                }
                System.out.println("NA");
        }
}