Wrong size

We've found quite a big area for hanging some prints. No fancy frames, no particular order - just a large collage made of our photos. Half of it is already covered and looks cool. So, a few days ago I've ordered another batch of prints. The recent photos, as well as those taken a few years ago. Today it arrived. I've opened the package, briefly checked the prints - they're fine I thought. Except for one important thing - the size. It seems I just didn't update the order and eventually got almost 200 prints in 10x15 instead of 13x18 format. What a fail 🤦‍♂️