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You need to make use of the context-free-ness of the grammar (what you're presenting so far is just a regular grammar): U-> aUa | bUb | a | b | _ Will match things like "ababa" and "aabaa", but not "aabba". I'll leave it to you to alter this to your needs - but keep in mind that your specified language has the possibility of u being the empty string, hence it generates all strings in {a,b}*.
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