import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		for (int i = 1; i <= 10000; i++) {
			String line = sc.nextLine();
			int n = Integer.parseInt(line);
			System.out.println("Case" + " " + i + ":" + " " + n);

			if (n == 0) {
				break;
			}

		}

	}

}
/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