1. Calculate: $1.1+1.91+1.991+\ldots+\underbrace{1.99 \cdots 991}_{2018 \text { nines }}$, the integer part of the result is $\qquad$, and the decimal part is $0.00 \ldots \ldots .01$, with $\qquad$ zeros after the decimal point.
Reference answer: 4037, 2018