#include<iostream>
#include<algorithm>
#include<vector>
#include<set>
#include<string>
#include<sstream>
#include<cctype>
#include<functional>
using namespace std;

int main()
{
	int a, sum = 0;
	string s;
	stringstream ss;
	cin >> s;
	for (int i = 0; i < static_cast<int>(s.size()); i++)
	{
		if (isdigit(s[i]))
		{
			ss << s[i]; ss >> a; ss.clear();
			sum += a;
		}
	}
	cout << sum << endl;
	return 0;
}