import java.util.*;
class Test33{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String str = sc.next();
		
		if(str.indexOf("OOO") != -1){
			System.out.println("East");
		}else if(str.indexOf("XXX") != -1){
			System.out.println("West");
		}else{
			System.out.println("NA");
		}
	}
}