# 0520. Detect Capital

https://leetcode.com/problems/detect-capital

## Description

We define the usage of capitals in a word to be right when one of the following cases holds:

* All letters in this word are capitals, like `"USA"`.
* All letters in this word are not capitals, like `"leetcode"`.
* Only the first letter in this word is capital, like `"Google"`.

Given a string `word`, return `true` if the usage of capitals in it is right.

**Example 1:**

```
**Input:** word = "USA"
**Output:** true
```

**Example 2:**

```
**Input:** word = "FlaG"
**Output:** false
```

**Constraints:**

* `1 <= word.length <= 100`
* `word` consists of lowercase and uppercase English letters.

## ac

```java
```
