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

class Main
{
	public static void main (String[] args) throws IOException
	{
  		Scanner in = new Scanner(System.in);

		for(int i = 1; i > 0; i++){

	      	String X;
	  		int x;
	
	  		X = in.nextLine();
	  		x = Integer.parseInt(X);
	
	      	if(x == 0){
	        	break;
	      	}else{
		  		System.out.println("Case " + i + ": " + x);
      		}
    	}
	}
}
/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