text: /*
      written by Pankaj Kumar.
      country:-INDIA
  */
  #include <bits/stdc++.h>
  using namespace std;
  typedef long long ll ;
  typedef set<pair<int,int>> spi;
  typedef set<pair<ll,ll>> spl;
  typedef vector<pair<int,int>> vpi;
  typedef vector<int> vi;
  typedef vector<ll> vl;
  typedef vector<bool> vb;
  typedef vector<char> vc;
  typedef vector<pair<ll,ll>> vpl;
  typedef vector<string> vs;
  typedef map<int,int>mi;
  typedef map<ll,ll> ml;
  typedef set<string> ss;
  typedef set<char>sc;
  typedef set<int> si;
  typedef set<ll> sl;
  #define pan cin.tie(0);cout.tie(0);ios_base::sync_with_stdio(0);
  // define values.
  #define mod 1e9+7LL
  #define phi 1.618
  /* Bit-Stuff */
  #define get_set_bits(a) (__builtin_popcount(a))
  #define get_set_bitsll(a) ( __builtin_popcountll(a))
  #define get_trail_zero(a) (__builtin_ctz(a))
  #define get_lead_zero(a) (__builtin_clz(a))
  #define get_parity(a) (__builtin_parity(a))
  /*  Abbrevations  */
  #define ff first
  #define ss second
  #define mp make_pair
  #define line cout<<endl;
  #define pb push_back
  #define Endl "\n"
  // loops
  #define loop(i,start,end) for(ll i=ll(start);i<ll(end);i++)
  #define loop0(num) for(ll i=0;i<ll(num);i++)
  #define forin(arr,n) for(ll i=0;i<n;i++) cin>>arr[i];
  // Some print
  #define no cout<<"NO"<<endl;
  #define yes cout<<"YES"<<endl;
  #define cc ll test;cin>>test;while(test--)
  // sort
  #define all(V) (V).begin(),(V).end()
  #define srt(V) sort(all(V))
  #define srtGreat(V) sort(all(V),greater<ll>())
  // function
  
  ll power(ll x,   ll y, ll p)  
  {  
      ll res = 1;      
      x = x % p;             
      while (y > 0)  
      {    
          if (y & 1)  
              res = (res*x) % p;   
          y = y>>1; 
          x = (x*x) % p;  
      }  
      return res;  
  } 
  /* ascii value 
  A=65,Z=90,a=97,z=122 1=49
  */
  /*  -----------------------------------------------------------------------------------*/
  // freopen("input.txt", "r", stdin);
  // freopen("output.txt", "w", stdout);
  
  
  int main()
  {
      cc
      {
          ll x,y,k,n;
          cin>>x>>y>>k>>n;
          if(y>=x)
              cout<<"LuckyChef"<<endl;
          else
          {
              ll temp,diff=abs(y-x);
              ll a,b;
              vector<pair<ll,ll>> v;
              loop(i,0,n)
              {
                  cin>>a>>b;
                  v.pb(mp(a,b));
              }
              ll flag=0;
              for(ll i=0;i<n;i++)
              {
                  if(v[i].ff>=diff&&v[i].ss<=k)
                  {
                      flag=1;
                      break;
                  }
              }
              if(flag==1)
                  cout<<"LuckyChef"<<endl;
              else
                  cout<<"UnluckyChef"<<endl;
          }
      }
      
  }