Sum of Even Digits

Given an integer N, your task is to compute the sum of all even digits in N. The input will consist of a single integer, and you need to output the sum of its even digits.

For example, if N = 12345, the even digits are 2 and 4, so the output should be 6. If there are no even digits, the output should be 0.

Note: Ensure that your solution reads input from stdin and writes the result to stdout. Use efficient methods for parsing and processing the integer.

inputFormat

The input consists of a single line containing an integer N.

outputFormat

Output a single line containing the sum of all even digits in the number N.## sample

12345

6