//#pragma GCC optimize("Ofast,no-stack-protector")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx")
//#pragma GCC target("avx,tune=native")
// Anand Jaisingh
#include<bits/stdc++.h>
using namespace std;
typedef complex<double> base;
typedef long double ld;
typedef long long ll;
#define pb push_back
#define pii pair<int,int>
#define pll pair< ll , ll >
#define vi vector<int>
#define vvi vector< vi >
const int maxn=(int)(1e5+5);
const ll mod=(ll)(1e9+7);
int a[maxn];
int main()
{
ios_base::sync_with_stdio(0);cin.tie(0);
int t;cin>>t;
while(t>0)
{
int p1,p2,k;cin>>p1>>p2>>k;
int now=(p1+p2)/k;
cout<<(now%2==0?"CHEF":"COOK")<<endl;
t--;
}
return 0;
}
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