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# 520. 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.