You will be given a definition of a task first, then some input of the task.
Given a text, write a compressed version of it in a single sentence.

Simply check off your tax-deductible contribution on the enclosed membership invitation. Please mail it back today in the envelope provided for your convenience, so that we can continue to carry on this vital ministry.
Output:
Check off your tax-deductible contribution on the invitation and please mail it back today.