How should I practice Count Characters Before Uppercase?

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Problem · String

Count Characters Before Uppercase

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Problem statement

Given a string of letters, containing both uppercase and lowercase letters, return the number of different characters where all lowercase of that character appear before any uppercase letter.

Function

countCharactersBeforeUppercase(s: String) → int

Examples

Example 1

s = "aaAbcCABBc"return = 2

Here the output is 2, a and b, c iss not counted.

Problem statement

Function

Examples

Example 1

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