uva 11875

#include<stdio.h>
int main()
{
    int t,k,n,i,j,a[20],ans,b,temp;
    while(scanf("%d",&t)==1)
    {
        for(i=1;i<=t;i++)
        {
            scanf("%d",&n);
            for(k=1;k<=n;k++)
            {



                scanf("%d",&a[k]);

            }
                printf("Case %d: %d\n",i,a[k/2]);

        }
    }
    return 0;

}