a, b, ans, c = input(), input(), 0, [0]
d = len(b) - len(a)
for i in range(len(b)):
c.append(c[-1] + int(b[i]))
for i in range(len(a)):
ones = c[d + i + 1] - c[i]
zeros = d + 1 - ones
ans += ones if a[i] == "0" else zeros
print(ans)
#include <bits/stdc++.h>
using namespace std;
int main() {
string s,t;
cin>>s>>t;
set<string>se;
long long sum=0;
vector<int>z(t.size()+1),o(t.size()+1);
for(int i=0;i<t.size();i++)
{
z[i+1]+=z[i]+(t[i]=='0');
o[i+1]+=o[i]+(t[i]=='1');
}
for(int i=0;i<s.size();i++)
{
int l=i,r=t.size()-s.size()+i+1;
if(s[i]=='1') sum+=z[r]-z[l];
else
sum+=o[r]-o[l];
}
cout<<sum;
return 0;
}
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