#include <bits/stdc++.h>
const int N = 200100;
char a[N], b[N];
int cnt[330];
int main() {
  int la, lb, i;
  long long ans = 0;
  scanf("%s%s", a, b);
  la = strlen(a), lb = strlen(b);
  for (i = 0; i < lb - la; i++) cnt[b[i]]++;
  for (i = 0; i < la; i++) {
    cnt[b[lb - la + i]]++;
    if (a[i] == '0')
      ans += cnt['1'];
    else
      ans += cnt['0'];
    cnt[b[i]]--;
  }
  printf("%I64d\n", ans);
  return 0;
}
