#include <bits/stdc++.h>
using namespace std;
const string EVEN = "Chef";
const string ODD = "Chefu";
string te() {
	int n;
	char name[7];
	scanf("%d%s", &n, name);
	bool evenStarts = (strlen(name) == EVEN.length()); 
	vector<int> in(n);
	for(int i = 0; i < n; ++i)
		scanf("%d", &in[i]);
	if(n == 1)
		return in[0] % 2 ? ODD : EVEN;
	if(evenStarts == (n % 2 == 0))
		return EVEN; // he will finish so he can get an even number
	int cnt = 0;
	for(int i = 0; i < n; ++i)
		if(in[i] % 2) {
			++cnt;
			++i; // skip the next number
		}
	if(cnt >= (n + 1) / 2)
		return ODD;
	return EVEN;
}

int main() {
	int T;
	scanf("%d", &T);
	while(T--) printf("%s\n", te().c_str());
}