using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace programPractice
{
    class Program
    {
        static void Main(string[] args)
        {
                string marubatsu = Console.ReadLine();

                int w = marubatsu.IndexOf("XXX");
                int e = marubatsu.IndexOf("OOO");

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