Given a word, you need to judge whether the usage of capitals in it is right or not.
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 if it has more than one letter, like "Google".
- Otherwise, we define that this word doesn't use capitals in a right way.
Input: 'USA'
Output: True
Input: 'FlaG'
Output: False
The input will be a non-empty word consisting of uppercase and lowercase latin letters.