3. Piplu wrote a 2020-digit number: $5368 \cdots \cdots$. He can arbitrarily extract a four-digit number from this multi-digit number, and it can always be divided by 11. The sum of the digits of this multi-digit number is $\qquad$ .
\begin{tabular}{c}
3 \\
\hline 11110
\end{tabular}