3) Write the seven-digit number 1357924 287 times to form a 2009-digit number “$13579241357924 …$”. Delete all the digits in the odd positions (counting from left to right) of this new number to form a new number, then delete all the digits in the odd positions of the new number, and continue this process until only one digit remains. What is the last remaining digit? $\qquad$
3) 3.