#include <iostream>
#include<array>
#include <bits/stdc++.h>
#include<string>
using namespace std;
int main ()



{
    int n, t,s,maxs=0,k=0;
    cin>>t;
    while(t--){
        maxs=0;
        k++;
        cin>>n;
        while(n--){
                cin>>s;
                maxs=max(maxs,s);

        }
        cout<<"Case "<<k<<": "<<maxs<<endl;

    }

    return 0;
}