IST interview questions

Very weird, Started with a review of the assignment I did, the review took about 2 hours, after those two hours which was after my current job (in the end of the day), they asked me an interview question, which I did not even get enough time to think about, they did then let me take it home and do it, I did it the same night and sent it to them with no response. They did not even give any feedback, they ghosted me.