the size 1 means convex heart，the size 2 means concave heart<p> <b><b><img src="https://contestimg.wish.com/api/webimage/5ab9b9f75708590dc0336c9e-original.jpg" noproxy><img src="https://contestimg.wish.com/api/webimage/5ab9b9f75708590dc0336c9e-1-original.jpg" noproxy><img src="https://contestimg.wish.com/api/webimage/5ab9b9f75708590dc0336c9e-2-original.jpg" noproxy><img src="https://contestimg.wish.com/api/webimage/5ab9b9f75708590dc0336c9e-3-original.jpg></b></b></p>