Proper Capitals

Easy

You are given a word word made of English letters. Its capitals are used properly if one of the following holds: - every letter is a capital, as in NASA; - no letter is a capital, as in river; - only the first letter is a capital, as in Paris. Return True if the word uses capitals properly and False otherwise.

Example 1

word='NASA' → True

Every letter is a capital, which is allowed.

Example 2

word='Paris' → True

Only the first letter is a capital, which is also fine.

Example 3

word='iPhone' → False

The capital is not at the start, so none of the three rules applies.

Constraints

1 ≤ len(word) ≤ 100
word consists of uppercase and lowercase English letters

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Topics

String

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Input

word='NASA'

Expected

True

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