#include <iostream>
#include <string>
#include <cstdlib>

using namespace std;

unsigned int k = 0, cnt = 0;

int F(string s, int iter);

int main()
{
    string str;
    unsigned int sumPos = 0;
    getline(cin, str);
    while (k < str.length())
    {
    if (isdigit(str[k]))
        sumPos += F(str, k);
    else
        k++;
    }
    cout << sumPos;
    return 0;

}


int F(string s, int iter)
{
    string sLoc = "";
    int pos = 0,sumLoc;
    int sign = 1;
    if ((s[k - 1] == '-') && (k >= 1))
        sign *= -1;
    while (isdigit(s[iter]))
    {
        sLoc += s[iter];
        iter++;
        pos++;
    }
    k += pos;
    char* str = new char[pos];
    sumLoc = atoi(sLoc.c_str());
    return sign * sumLoc;
}