This game starts with a positive integer. Two players take turns to remove a single digit from that integer. After the digit is removed any resulting leading zeros are removed.

For example, removing a digit from $105$ results in either $5$, $10$ or $15$.

The winner is the person who removes the last nonzero digit.

Define $W(N)$ to be how many positive integers less than $N$ for which the first player can guarantee a win given optimal play. You are given $W(100)=18$ and $W({10}^4)=1656$.

Find $W({10}^{18})$.