import java.io.*;
import java.util.*;


public class Main_yukicoder486 {

	private static Scanner sc;
	private static Printer pr;

	private static void solve() {
		char[] s = sc.next().toCharArray();

		int east = 0;
		int west = 0;

		for (char c : s) {
			if (c == 'O') {
				east++;
				west = 0;
			} else {
				west++;
				east = 0;
			}

			if (west >= 3) {
				pr.println("West");
				return;
			} else if (east >= 3) {
				pr.println("East");
				return;
			}
		}

		pr.println("NA");
	}

	// ---------------------------------------------------
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		pr = new Printer(System.out);

		solve();

		pr.close();
		sc.close();
	}

	private static class Printer extends PrintWriter {
		Printer(PrintStream out) {
			super(out);
		}
	}
}