#include <bits/stdc++.h>
using namespace std;
const long long mod = 1e9 + 7;
const long long mod2 = 998244353;
const long long inf = LLONG_MAX;
const double eps = 1e-12;
void _print(long long t) { cerr << t; }
void _print(int t) { cerr << t; }
void _print(string t) { cerr << t; }
void _print(char t) { cerr << t; }
void _print(long double t) { cerr << t; }
void _print(double t) { cerr << t; }
void _print(unsigned long long t) { cerr << t; }
template <class T, class V>
void _print(pair<T, V> p);
template <class T>
void _print(vector<T> v);
template <class T>
void _print(set<T> v);
template <class T, class V>
void _print(map<T, V> v);
template <class T>
void _print(multiset<T> v);
string a, b;
long long sm[202020];
void solve() {
  cin >> a >> b;
  for (long long i = 0; i < ((long long)(b).size()); i++)
    sm[i + 1] = sm[i] + b[i] - '0';
  int diff = ((long long)(b).size()) - ((long long)(a).size());
  long long ans = 0;
  for (long long i = 0; i < ((long long)(a).size()); i++)
    if (a[i] == '0')
      ans += (sm[i + diff + 1] - sm[i]);
    else
      ans += (diff + 1 - (sm[i + diff + 1] - sm[i]));
  cout << ans;
  return;
}
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  clock_t start, end;
  start = clock();
  long long testcases = 1;
  while (testcases--) {
    solve();
    cout << "\n";
  }
  end = clock();
  double time_taken = double(end - start) / double(CLOCKS_PER_SEC);
  cerr << "\nTime taken:"
       << "\n"
       << fixed << setprecision(6) << time_taken << " sec\n";
  return 0;
}
template <class T, class V>
void _print(pair<T, V> p) {
  cerr << "{";
  _print(p.first);
  cerr << ",";
  _print(p.second);
  cerr << "}";
}
template <class T>
void _print(vector<T> v) {
  cerr << "[ ";
  for (T i : v) {
    _print(i);
    cerr << " ";
  }
  cerr << "]";
}
template <class T>
void _print(set<T> v) {
  cerr << "[ ";
  for (T i : v) {
    _print(i);
    cerr << " ";
  }
  cerr << "]";
}
template <class T>
void _print(multiset<T> v) {
  cerr << "[ ";
  for (T i : v) {
    _print(i);
    cerr << " ";
  }
  cerr << "]";
}
template <class T, class V>
void _print(map<T, V> v) {
  cerr << "[ ";
  for (auto i : v) {
    _print(i);
    cerr << " ";
  }
  cerr << "]";
}
