Sum of Numbers in a String

You are given a string s which contains a mix of alphabetic characters and digits. Your task is to extract all contiguous substrings that represent non-negative integers, convert them to numbers, and then compute the sum of these numbers.

For example, given the string abc123xyz45, the numerical substrings are 123 and 45. The answer is:

\(123 + 45 = 168\)

More formally, if the string contains numerical substrings \(n_1, n_2, \dots, n_k\), you should compute the sum:

\(\sum_{i=1}^{k}{n_i}\)

If the string does not contain any digits, the sum is 0.

inputFormat

The input consists of a single line containing the string s which may contain both letters and digits.

outputFormat

Output a single integer representing the sum of all numerical substrings found in s.

abc123xyz45

168