#include <bits/stdc++.h>
using namespace std;
long long arr[200200];
int main() {
  string a, b;
  cin >> a >> b;
  long long x = 0, y = 0;
  for (int i = 0; i <= b.size() - a.size(); i++) x += (b[i] - '0');
  for (int i = 0; i < a.size(); i++) {
    y += (a[i] == '0') ? x : (b.size() - a.size() + 1) - x;
    x += b[b.size() - a.size() + 1 + i] - b[i];
  }
  cout << y;
  return 0;
}
