import java.math.BigInteger;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Scanner;
import java.util.Set;

public class Main {
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		char prev = '\0';
		int count = 0;
		
		for(final char ch : sc.next().toCharArray()){
			if(prev != ch){
				prev = ch;
				count = 1;
			}else{
				count++;
				
				if(count >= 3){
					System.out.println(prev == 'O' ? "East" : "West");
					return;
				}
			}
		}
		
		System.out.println("NA");
	}
}