import java.util.*;

class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		
		String s = sc.next();
		//x=West o=East
		int w = s.indexOf("XXX");
		int o = s.indexOf("OOO");
//		System.out.println(w+":"+o);
		if (w==-1 && o==-1) System.out.println("NA");
		else if (w==-1 && o>=0) System.out.println("East");
		else if (w>=0 && o==-1) System.out.println("West");
		else System.out.println(w<o?"West":"East");
	}
}