import java.util.Scanner;

class Main{
    int i, x;
    public void aaaa(){
        Scanner sc = new Scanner(System.in);
        x = sc.nextInt();
        for(i = 1; x != 0; i++){
            System.out.println("Case " + i + ": " + x);
            x = sc.nextInt();
        }
    }
        public static void main(String[] args){
            new Main().aaaa();
        }
        
}
/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