using System;

public class Program {
	public void Solve() {
		char[] arr = Console.ReadLine().ToCharArray();
		char c;
		int count = 0;
		for (int i = 0; i < arr.Length; i++) {
			c = arr[i];
			count++;
			for (int j = i + 1; j < arr.Length; j++) {
				if (arr[j].Equals(c)) {
					count++;
					if (count >= 3) {
						if (c.Equals('O')) {
							Console.WriteLine("East");
						} else {
							Console.WriteLine("West");
						}
						return;
					}
				} else {
					i = j - 1;
					count = 0;
					break;
				}
			}
		}
		Console.WriteLine("NA");
	}
	
	public static void Main(string[] args) {
		Program program = new Program();
		program.Solve();
	}
}