import java.util.Scanner;

class Main{
    public static void main(String[] args){
        Scanner input = new Scanner(System.in);
        int count = 1;
        while(true){
            String str = input.nextLine();
            if(!str.equals("0")){
                System.out.println("Case "+ count + ": " + str);
                count = count + 1;
            }else{
                break;
            }
        }
    }
}

/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