After your strong jump shift of 2♥ and partner’s raise to 3♥, cue bidding and an inquiry from partner about key cards, the 5NT bid asked about kings. Your response showed the ♣K. That was enough for North to put you in the grand slam.(you had already shown one or four key cards (aces and the trump king). West gets off to the lead of the ♥9. What is your plan for taking all the tricks?