#include<bits/stdc++.h>
using namespace std;

int main(){
  int T, Y, X, K, N, P, C;
  int ok;

  scanf("%d",&T);
  while(T--){
    scanf("%d%d%d%d",&X,&Y,&K,&N);

    ok = 0;
    while(N--){
      scanf("%d%d",&P,&C);
      if(K >= C && P >= X-Y) ok = 1;
    }
    puts(ok?"LuckyChef":"UnluckyChef");
  }

  return 0;
}