3♣ showed a 55 game-forcing, and dbl didn't ask for any lead in particular. East is a strong player. West thinks for a while and leads the diamond 4, on which East inserts the 8 (can't remember pard's spots, sorry) and you take the king.
What do you play now? Oh and won't someone PLEASE write a bidding template? Thx

Help

LHO par RHO you
pass pass pass 1NT
pass 2♦ pass 2♥
pass 3♣ pass 3NT
pass pass dbl rdbl
(all pass)