import java.util.Scanner;

/**
 * @author ??\???
 *
 */
public class Main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		for (int i = 1, x = scanner.nextInt(); x != 0; i++, x = scanner.nextInt()) {
			System.out.println("Case " + i + ": " + x);
		}
		scanner.close();
	}

}
/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