import java.io.*;
import java.util.StringTokenizer;

class Main{
    public static void main(String[] args) throws IOException{
        BufferedReader r =
         new BufferedReader(new InputStreamReader(System.in));       
        String line = r.readLine();   
        
        int cnt=1;
        while(line!=null){ 
            int buf = Integer.parseInt(line);
            if (buf == 0) break;
            if (cnt > 10000) break;
            if (1 <= buf && buf <= 10000){
                System.out.println("Case "+cnt+": "+buf);
                cnt++;
            }
            line = r.readLine();
        }        
    }
}
/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