import java.util.Scanner;

    public class Main {
        public static void main(String[] args) {
            Scanner read = new Scanner(System.in);
            int t = read.nextInt();
            int ans[] = new int[t];
            for (int i = 0; i < t; i++) {
                ans[i] = 0;
                int n = read.nextInt();
                for (int j = 0; j < n; j++){
                    int s = read.nextInt();
                    if (ans[i] < s) {
                        ans[i] = s;
                    }
                }
            }
            for (int i = 1; i <= t; i++) {
                System.out.println("Case "+i+": "+ans[i-1]);
            }
        }
    }