import java.io.*;

public class Main {
    public static void main(String[] args) {
        InputStreamReader isr = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(isr);
        try {
            for(int i = 1; ; i++) {
                int x = Integer.parseInt(br.readLine());
                if(x == 0) {
                    break;
                }
                System.out.println("Case " + i + ": " + x);
            }
        } catch(IOException e) {
            e.printStackTrace();
        }
    }
}
/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