using System;

namespace yukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            string s = Console.ReadLine();
            int count = 0;
            int count2 = 0;
            bool c0 = false;
            bool c2 = false;
            bool e=false;
            bool w=false;
            for (int i = 0; i < s.Length; i++)
            {
                string a = s.Substring(i, 1);
                if (a == "O")
                {
                    count++;
                    c0 = true;
                }
                else
                {
                    count2++;
                    c2 = true;
                }
                if (count == 3&&c2==false)
                {
                    e = true;
                }
                else if (count2 == 3 && c0 == false)
                {
                    w = true;
                }
                else if(count ==3&& c2 == true)
                {
                    c0 = false;
                    c2 = false;
                    count = 0;
                    count2 = 0;
                }
                else if (count2 == 3 && c0 == true)
                {
                    c0 = false;
                    c2 = false;
                    count = 0;
                    count2 = 0;
                }
            }
            if (e==true)
            {
                Console.WriteLine("East");
                
            }
            else if (w == true)
            {
                Console.WriteLine("West");
            }
            else
            {
                Console.WriteLine("NA");
            }
        }
    }
}