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We want to make sure we capture both "S" and "s" in the user’s input. We could write separate if / else statements to handle this, but we can also use .downcase! to convert the user’s input to all lower case. That way, we only have to search for "s".

Instructions

1.

Call the .downcase! method on user_input. Make sure to include the ! so that the user’s string is modified in-place; otherwise, Ruby will create a copy of user_input and modify that instead.

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