#include<cstdio>
#include<iostream>
using namespace std;
int main()
{
int test_case,n,i,a,c=0;
cin >> test_case;
while(test_case--)
{
c++;
int max=0;
cin>>n;
for(i=0;i<n;i++){
cin>>a;
if(a>max)
max=a;
}
cout <<"Case "<< c <<": "<<max<<endl;
}
return 0;
}
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