根据该逻辑，把输入的文本转换成想要的大小写形式并发送给用户。
Based on that logic, you change the incoming text to the desired case and send the text back to the user.
还可以用混合大小写字母的形式拼写字符串。
You can also spell the strings using mixed uppercase and lowercase letters.
选项可以是大写、小写或大小写混合形式。
You can write options in uppercase, lowercase, or mixed case.
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