import java.util.Scanner;

class Main {
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);

        int x;
        int count = 1;

        while (true){
            x = Integer.parseInt(scan.next());

            if (x == 0)
                break;
            System.out.println("Case " + count + ": " + x);
            count += 1;
        }
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz