#include
using namespace std;
int main() {
long long int t;cin>>t;
while(t–){
long long int n,x,s=0;
cin>>n;
for(int i=0;i<n;i++){
cin>>x;
if(x!=1)
s+=(x-1);
}
if(s%2==0)
cout<<"Chefina"<<endl;
else
cout<<"Chef"<<endl;
}
return 0;
}