Score : $500$ points
Given is a string $S$ consisting of digits from $1$ through $9$.
From this string $S$, let us make a formula $T$ by the following operations.
+ between the $x$-th and $(x+1)$-th characters of $T$.For example, when $S=$ 1234 and $A= \lbrace 2,3 \rbrace$, we will have $T$= 12+3+4.
Consider evaluating all possible formulae $T$ obtained by these operations. Find the sum, modulo $998244353$, of the evaluations.
1, 2, 3, 4, 5, 6, 7, 8, and 9.Input is given from Standard Input in the following format:
$S$
Print the answer.
1234
1736
There are eight formulae that can be obtained as $T$: 1234, 123+4, 12+34, 12+3+4, 1+234, 1+23+4, 1+2+34, and 1+2+3+4.
The sum of the evaluations of these formulae is $1736$.
1
1
$S$ may have a length of $1$, in which case the only possible choice for $A$ is the empty set.
31415926535897932384626433832795
85607943
Be sure to find the sum modulo $998244353$.