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

public class Main {

    public static void main(String[] args) {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
            String line = br.readLine();
            int count = 0;
            
            while(line.equals("0") == false){
            	System.out.println("Case "+ ++count + ": " +line);
            	//strList.add(line);
                line = br.readLine();
            }
            /*
            for (String str : strList) {
            	System.out.println("Case "+ (strList.indexOf(str) + 1) + ": " +str);
			}
            */
            br.close();
        } catch (IOException e) {
            System.err.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