import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main{

	public static void main(String[] args) {
		// TODO ?????????????????????????????????????????????
		Scanner sc = new Scanner(System.in);

		List<String> list = new ArrayList<String>();
		for (int i = 0; i < 10001; i++) {
			String line = sc.nextLine();
			if (line.equals("0")) {
				break;
			}
			list.add(line);
		}

		for (int j = 1; j < list.size()+1; j++) {
			String string = list.get(j - 1);
			System.out.println("Case " + j + ": " + string);
		}
	}

}
/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