using System;
using System.Linq;

public class Test
{
	public static void Main()
	{
		var S = Console.ReadLine();
		int east = 0, west = 0;
		for (int i = 0; i < S.Length; i++)
		{
			if (S[i] == 'O')
			{
				if (++east == 3)
				{
					Console.WriteLine("East");
					return;
				}
				west = 0;
			}
			else
			{
				if (++west == 3)
				{
					Console.WriteLine("West");
					return;
				}
				east = 0;
			}
		}
		Console.WriteLine("NA");
	}
}