import java.util.*;
public class LuckyNumber{
 public static void main(String args[]){
Scanner in = new Scanner(System.in);
int x = in.nextInt();
 int a1,a2,a3,b1,b2,b3;
a1 = x/100000; a2 = (x/10000)%10; a3 = (x/1000)%10;
b1 = (x/100)%10; b2 = (x/10)%10; b3 = x%10;
     if((a1+a2+a3) == (b1+b2+b3)) System.out.println("Lucky Number");
 else if(a1+a2+a3-(b1+b2+b3)>1 ||(b1+b2+b3)-(a1+a2+a3)>1) {
     System.out.println("prostoi bilet");
 }
else System.out.println("Lucky Number budet sleduwii ili prediduwi bilet");
     }
        }