Strrev: Why this is not correct?

I am at the exercise of php on in-built function. It is about strrev function. I don’t understand why it is showing an error. please check screen-shot. It says “Did you call the strrev() function with the string we provided?”

Check the capitalisation of the k in keep it up. Should it be a capital K?

■■■■. such a fool i am.

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