import java.util.*;

public class Main {
	public static void main(String[] arg){
		Scanner in = new Scanner(System.in);
		int i = 1;
		while(in.hasNext()) {
            String buf = in.nextLine();
            if(Integer.parseInt(buf) == 0){
            	break;
			}
            System.out.println("Case "+ i +": "+ buf);
            i++;
        }
	}
}
/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