
import java.io.*;
import java.util.*;

public class Main {
	public static void main(String args[]) throws IOException {
		//BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		Scanner scan = new Scanner(System.in);
		StringBuilder b = new StringBuilder();


		
		int i,s;
		i = 0;

		while(true){
			i++;
			s = scan.nextInt();
			//s = Integer.parseInt(br.readLine());
			if(s == 0){break;}
			
			//str = str+ "Case " + Integer.toString(i) + ": " + str + "\n";
			
			b.append("Case ");
			b.append(Integer.toString(i));
			b.append(": ");
			b.append(Integer.toString(s));
			b.append("\n");
			
			
			
		}

		System.out.print(new String(b));

	}
}
/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