using System;

namespace yukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            string x = Console.ReadLine();
            string y = Console.ReadLine();
            int A, B;
            if(int.TryParse(x,out A) && int.TryParse(y,out B))
            {
                if((A <= 12345) && (B <= 12345))
                {
                    Console.WriteLine("{0}", "OK");
                }
                else
                {
                    Console.WriteLine("{0}", "NG");
                }
            }
            else
            {
                Console.WriteLine("{0}", "NG");
            }
            
        }
    }
}