import java.util.*;
public class A{
	static Scanner s = new Scanner(System.in);
	public static void main(String[] args) {
		char in[] =
				s.next()
				.replaceFirst("OOO", "1")
				.replaceFirst("XXX", "2")
				.toCharArray();

		for(char c:in) {
			switch(c) {
			case '1':
				System.out.println("East");
				return;
			case '2':
				System.out.println("West");
				return;
			}
		}
		System.out.println("NA");
	}
}