import java.io.*;  

public class Main {
    public static void main(String[] args) throws IOException {

	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	int i=0;
    int y = 1;
    String buf = br.readLine();
    //String[] x = buf.split("",0);
    int z = Integer.parseInt(buf);
    while(z!=0){
    	
       	System.out.println("Case "+ y + ": "  + z);
    	buf = br.readLine();
    	z = Integer.parseInt(buf);
    	y++;
    }
  }
    
}
/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