adjectives

[hector51]

hello teachers!

I want to write a sentence like "She is a nice,intelligent and helpful co-worker"

is there anything wrong with the adjectives "intelligent" since I think it must be preceded by the article "an" (but "nice" and "helpful" are preceded by "a")

thanks in advance!

[Fazzu]

I don't see any wrong in that sentence.And also add this will make the sentence more alive I hope:"....and a helpful co-worker."

[Bluefields]

It's correct. Whether to use "a" or "an" depends on the following word and nothing else.