chatgptHello! How may I assist you today输入一段英文文章只包含字母和空格按照出现次序逐一输出文章中的单词出现次数多的仅输出一次单词不区分大小写一律按小写输出

I have a cat named Whiskers. Whiskers is a black and white cat who loves to play with toy mice.

i have a cat named whiskers is black and white who loves to play with toy mice.