Problems
Divisibility by 11
Divisibility by 11
Divisibility by $11$ is often stated as follows: add the digits standing separately at even and at odd positions. If the difference of these sums is divisible by $11$, then the number is divisible by $11$. Calculate the product of these sums.
Input
A positive integer $n$$(10 ≤ n ≤ 2 \cdot 10^9)$.
Output
Print the product of sums of digits at even and at odd positions.
Input example #1
27
Output example #1
14
Input example #2
2821
Output example #2
36
Input example #3
10001
Output example #3
0