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

public class Main {

	public static void main(String[] args)  {

		Scanner scanner = new Scanner( System.in );

		ArrayList<Integer> nums = new ArrayList<Integer>();

		while ( true ) {
			String inputText = scanner.nextLine();


			int x = Integer.parseInt( inputText );
			if ( x == 0) {
				break;
			}
			nums.add( x );
		}

		for ( int i = 0; i < nums.size(); i++ ) {
			System.out.println("Case " + (i + 1) + ": " + nums.get( i ) );
		}

		scanner.close();
	}
}
/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