class Program
{
    static void Main(string[] args)
    {
        string input = Console.ReadLine()!;
        int oCount = 0;
        int xCount = 0;

        foreach (char c in input)
        {
            if (c == 'O')
            {
                oCount++;
                if (oCount == 3)
                {
                    Console.WriteLine("East");
                    return;
                }

                xCount = 0;
            }
            else
            {
                xCount++;
                if (xCount == 3)
                {
                    Console.WriteLine("West");
                    return;
                }

                oCount = 0;
            }
        }

        Console.WriteLine("NA");
    }
}