import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int[] num = new int[10000];
		for (int i = 0; i < 10000; i++) {
			String line = sc.nextLine();
			num[i] = Integer.parseInt(line);
			if (num[i] == 0) {
				break;
			}
		}
		for (int i = 0; i < num.length; i++) {
			if (num[i] == 0) {
				break;
			}
			System.out.println("Case " + (i + 1) + ": " + num[i]);
		}
	}
}
/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