#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef string str;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    str s1, s2;
    cin >> s1 >> s2;
    ll countt = 0, nmax = LONG_MIN;
    for (ll i = 0; i < s1.size(); i++)
    {
        if (s1[i] == 'o') countt++;
        else
        {
            nmax = max(nmax, countt);
            countt = 0;
        }
    }
    nmax = max(nmax, countt);
    countt = 0;
    for (ll i = 0; i < s2.size(); i++)
    {
        if (s2[i] == 'o') countt++;
        else
        {
            nmax = max(nmax, countt);
            countt = 0;
        }
    }
    nmax = max(nmax, countt);
    cout << nmax;
    return 0;
}