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#include <bits/stdc++.h>

using namespace std;

int main(){
    //freopen("ip.txt","r",stdin);
    int t;
    cin>>t;
    while (t--){
        int x,y,n,k;
        cin>>x>>y>>k>>n;
        vector<int>p(n);
        vector<int>c(n);
        int d = x - y;
        for (int i=0; i<n; i++){
            cin>>p[i]>>c[i];
        }
        int f = 1;
        for (int i=0; i<n; i++){
            if(p[i] >= d && c[i] <= k){
                f = 0;
                break;
            }
        }
        if(f == 0){
            cout<<"LuckyChef";
        }else{
            cout<<"UnluckyChef";
        }
        cout<<endl;
    }
    return 0;
}