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

public class Main{


	public static void main(String[] args){

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

		try{
		for(int i=1;;i++){
			int x=Integer.parseInt(reader.readLine());
			if(x==0)break;
			System.out.println("Case "+i+": "+x);

		}
		}catch(IOException e){
			System.out.println("??¨??????:"+e);

		}

	}

}
/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