using System;

public class Program

{

    public static void Main()

    { 

        int[] num = new int[6];

        for(int i = 0; i < 6;){

            num[i] = Convert.ToInt32(Console.ReadLine());

            i++;

        }   

        int summ1 = num[0] + num[1] + num[2];

        int summ2 = num[3] + num[4] + num[5];

            if (summ1 == summ2){

                Console.WriteLine("lucky tkt!1");

            } else {Console.WriteLine("unlucky tkt :(");}

    }

}