import java.util.Scanner;


public class Main {

	public static void main(String[] args) {

		int cnt = 0;
		Scanner sc = new Scanner(System.in);
		int input = 0;
		while((input = sc.nextInt()) != 0) {
			cnt++;
			System.out.println("Case " + cnt + ":" + " " + input);
		}
	}
}
/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