using System;

namespace yukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            string s = Console.ReadLine();
            string[] s1 = new string[s.Length];
            int count = 0;
            int count2 = 0;
            bool c0 = false;
            bool c2 = false;
            bool e=false;
            bool w=false;
            int start=0;
            int win=0;

            for(int x = 0; x < s.Length; x++)
            {
                s1[x]= s.Substring(x, 1);
            }
            for (int i = 0; i < s.Length; i++)
            {   
                
                for(int j = i; j < s.Length; j++)
                {

                    if (s1[j] == "O")
                    {
                        count++;
                        c0 = true;
                    }
                    else
                    {
                        count2++;
                        c2 = true;
                    }

                    if (count == 3 && c2 == false)
                    {
                        e = true;
                    }
                    else if (count2 == 3 && c0 == false)
                    {
                        w = true;
                    }
                    if (j + 3 == j)
                    {
                        e = false;
                        w = false;
                        break;

                    }
                }
                c0 = false;
                c2 = false;
                count = 0;
                count2 = 0;
                if (e == true)
                {
                    if (win == 0)
                    {
                        start = 1;
                        win++;
                    }
                    
                }
                else if (w == true)
                {
                    if (win == 0)
                    {
                        start = 2;
                        win++;
                    }
                }
            }

            if (start==1)
            {
                Console.WriteLine("East");
                
            }
            else if (start==2)
            {
                Console.WriteLine("West");
            }
            else
            {
                Console.WriteLine("NA");
            }
        }
    }
}