---
# System prepended metadata

title: 大小寫調換
tags: [實習題目]

---

###### tags: `實習題目`
# 大小寫調換

## Description
請寫一函式能讓輸入句子的大寫換成小寫，小寫換成大寫

## Sample Input
```
I aM HapPY.
```
## Sample Output
```
i Am hAPpy.
```