using System;

namespace yukicoder486
{
	class MainClass
	{
		public static void Main(string[] args)
		{
			string s;
			s = Console.ReadLine();
			string ans;
			int i;

			ans = "NA";
			if (s.Length >= 3) {
				for (i = 0; i < s.Length - 2; i ++) {
					if (s.Substring(i, 3) == "OOO"){
						ans = "East";
						break;
					}
					else if (s.Substring(i, 3) == "XXX") {
						ans = "West";
						break;
					}
				}
			}
			Console.WriteLine(ans);
		}
	}
}