Comma Separated Sum

A string $S$ made up only of digits and commas is given. $S$ lists natural numbers in order, separated by single commas. Find the sum of all natural numbers written in $S$.

The first line contains the string $S$. The length of $S$ is at most 100, and $S$ consists only of digits and commas. Each natural number written in $S$ is at most 1,000,000.

Print the sum of the natural numbers written in $S$ on the first line.