import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String S = scan.next();
		scan.close();
		int cnt1 = 0;
		int cnt2 = 0;
		for(int i = 0; i < S.length(); i++) {
			char c = S.charAt(i);
			if(c == 'O') {
				cnt1 ++;
				cnt2 = 0;
			}else {
				cnt1 = 0;
				cnt2 ++;
			}
			if(cnt1 == 3) {
				System.out.println("East");
				System.exit(0);
			}else if(cnt2 == 3) {
				System.out.println("West");
				System.exit(0);
			}
		}
		System.out.println("NA");
	}
}