import java.util.Scanner;

public class Main {

	public static void main(String[] arges) {

		Scanner sc = new Scanner(System.in);
		String[] line = new String[10001];
		for (int i = 0; i < line.length; i++) {
			line[i] = sc.nextLine();
			if (line[i].equals("0")) {
				break;
			}
		}
		for (int i = 1; i < line.length; i++) {
			if (line[i - 1].equals("0")) {
				break;
			}
			int v = Integer.parseInt(line[i - 1]);
			System.out.println("Case " + i + ": " + v);
		}

	}
}
/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