import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;

public class Main {

	public static void main(String[] args) throws IOException{

		ArrayList<Integer> l = new ArrayList<Integer>();
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		while (true) {
			String inputNum = br.readLine();
			if (inputNum.equals("0")) {
				break;
			}

			l.add(Integer.parseInt(inputNum));
		}

		for (int i = 1; i <= l.size(); i++) {

			System.out.println("Case " + i + ": " + l.get(i-1));
		}


	}

}
/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