#include <cstdio>
#include <iostream>
using namespace std;
int main() {
    char c;
    int t = 0, ans = 0;
    while((c = getchar()) != EOF) {
        if('0' <= c && c <= '9') {
            t *= 10;
            t += c - '0';
        }
        else {
            ans += t;
            t = 0;
        }
    }
    cout << ans << endl;
}