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Lesson 4. September 24 - 30. Loops: while statement

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 (10n2 *109).

Output

Print the product of sums of digits at even and at odd positions.

Time limit 1 second
Memory limit 128 MiB
Input example #1
27
Output example #1
14
Input example #2
2821
Output example #2
36
Input example #3
10001
Output example #3
0