public class Program
{
    public static void Main()
    {
        //int num = int.Parse(Console.ReadLine() ?? string.Empty);
        //string[] str = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        string str = Console.ReadLine() ?? string.Empty;


        int indexo = str.IndexOf("OOO");
        int indexx = str.IndexOf("XXX");

        if(indexx > indexo)
        {
            Console.WriteLine("West");
        }
        else if(indexo > indexx)
        {
            Console.WriteLine("East");
        }
        else
        {
            Console.WriteLine("NA");
        }

    }
}