import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int count = 0;
        for (char c : sc.next().toCharArray()) {
            if (c == 'O') {
                if (count < 0) {
                    count = 0;
                }
                count++;
            } else {
                if (count > 0) {
                    count = 0;
                }
                
                count--;
            }
            if (count >= 3) {
                System.out.println("East");
                return;
            } else if (count <= - 3) {
                System.out.println("West");
                return;
            }
        }
        System.out.println("NA");
    }
}