is there a way to delete all my unedited photos easily?

Hi,

I'm basically out of storage with 22000 photos and a lot of them are unedited.

I need to delete about 5000 photos to make some room, so is there an easy way of filtering them out? Just the ones I haven't made any edits to.

I can of course delete them manually but it's a lot to go through 

Thanks

Rebecca