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

public class Main {

	public static void main(String[] args) throws IOException
	{
		int[] n = new int[65535];
		int i=0,j;

		BufferedReader br = new BufferedReader(new InputStreamReader(System.in) );

		while(true)
		{
			n[i] = Integer.parseInt(br.readLine() );

			if(n[i]==0) break;
			else i++;
		}

		for(j=0; j<i; j++) System.out.println("Case " + (j+1) + ": " + n[j]);

	}
}
/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