import java.io.*;

class Main {
	public static void main(String[] args) throws java.io.IOException {

		BufferedReader input = new BufferedReader(new InputStreamReader(
				System.in));
		StringBuilder str = new StringBuilder();

		int i = 0;

		while (true) {
			i++;
			String tmp = input.readLine();
			int x = Integer.parseInt(tmp);

			if (x == 0)
				break;

			str.append("Case " + i + ": " + x + "\n");

		}

		System.out.print(str);

	}
}
/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