# Sum of even digits

Execution time limit is 1 second

Runtime memory usage limit is 128 megabytes

One long integer is given. Find the sum of its even digits.

## Input

One positive integer n (n ≤ `10^100`

).

## Output

Print the sum of even digits in number n.

## Examples

Input #1

Answer #1

Input #2

Answer #2

Submissions 6K

Acceptance rate 54%