import java.util.*;

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