#include <iostream>

using namespace std;

bool solve(int needed, int n, int money)
{
    bool solveable=false;
    while(n--)
    {
        int pi,ci;
        cin>>pi>>ci;
        if(pi>=needed && money>=ci)
            solveable=true;
    }
    return solveable;
}

int main()
{
    int t;
    cin>>t;
    while(t--)
    {
        int x,y,k,n;
        cin>>x>>y>>k>>n;
        if(solve(x-y,n,k))
            cout<<"LuckyChef"<<endl;
        else
            cout<<"UnluckyChef"<<endl;
    }
    return 0;
}