#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<ll> VL;
typedef vector<VL> VVL;
typedef pair<int, int> PII;

#define FOR(i, a, n) for (ll i = (ll)a; i < (ll)n; ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(x) x.begin(), x.end()
#define MP make_pair
#define PB push_back
#define MOD 1000000007
#define INF (1LL<<30)
#define LLINF (1LL<<60)
#define PI 3.14159265359
#define EPS 1e-12
#define int ll

signed main(void)
{
  string s;
  int ret = 0;
  while(cin >> s) {
    int tmp = 0;
    REP(i, s.size()) {
      if(s[i] >= '0' && s[i] <= '9') tmp = tmp*10+(s[i]-'0');
      else {
        ret += tmp;
        tmp = 0;
      }
    }
  }
  cout << ret << endl;
  return 0;
}