import static java.lang.System.out;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int counter = 1;
        while (scan.hasNext()) {
            int num = scan.nextInt();
            if (num == 0) {
                break;
            }
            out.printf("Case %d: %d%n", counter, num);
            counter += 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