#include<bits/stdc++.h>
using namespace std;
int main()
{
int kase,T=0;
int ages[11];
scanf("%d",&kase);
while(kase--)
{
int age,n,k=0;
cin>>age;
for(int i=0; i<age; i++)
{
scanf("%d",&n);
if(n >= 11 && n <= 20)
{
ages[i] = n;
k++;
}
}
//sort(ages,ages+k);
printf("Case %d: %d\n",++T,ages[k/2]);
}
return 0;
}