I just keep turning out novels. Often publishers ask me to do something and that's how I know what I'll do next. If they are going to do something of mine, they will have to find someone else to write the screenplays. Oh, every once a while somebody talks about doing it, but so far nobody has ever managed to dig up enough money for it. No, I don't have any input into that.
Publishers take care of that entirely.
They never ask any questions and I never offer any advice, because my artistic talent is zero. Well, there is a number of painters that I like very much. I don't know that I have any taste in art. No, I can't even draw a straight line with a ruler. In other words, the novels I write in nineteen eighties are very much like the novels I wrote in forties and fifties - they tend to be a little old fashioned.