33. Today is January 18, 2020, and it is displayed on the electronic calendar as 20200118. If there is a multi-digit number $202001188462 \cdots \cdots$, starting from the 9th digit, each digit is the unit digit of the product of the three preceding digits. According to this rule, what is the 2020th digit of this multi-digit number? $\qquad$ .
$2$