using System;
using System.Text;
using System.Linq;

namespace ConsoleApp11
{
    class Program
    {
        static void Main(string[] args)
        {
            int j = 0;

            string S = Console.ReadLine();

            for(int i = 0; i < S.Length - 2; i++)
            {
                if(S[i] == 'O' && S[i+1] == 'O' && S[i+2] == 'O')
                {
                    j = 1;
                    break;
                }
                else if(S[i] == 'X' && S[i+1] == 'X' && S[i+2] == 'X')
                {
                    j = -1;
                    break;
                }
            }

            if(j == 1)
            {
                Console.WriteLine("East");
            }
            else if(j == -1)
            {
                Console.WriteLine("West");
            }
            else
            {
                Console.WriteLine("NA");
            }
        }        
    }
}