There is a pile of identical cards, each card contains numbers from 1 to 33
Bill took one card and secretly marked 10 numbers on it.
Mark can do the same operation with several of remaining cards.
After that, boys show their cards to each other.
Mark wins if he has a card where at least three marked numbers coincide with bill’s numbers.
Find the smallest of cards mark should use to win the game and find the way to fill them.