There is no way of knowing the plural you is required here, so "Uandike" should be accepted. Also, if one chose to use a word like "heri" or "bora": Heri uandike or Bora uandike, I would also consider either of those correct.
Why cant I put "mwaandike" in this? As dsimonds says: there is no way of telling if this is pkural or not. 29062020