#include <bits/stdc++.h>
using ll = long long;
using llu = long long unsigned;

using namespace std;

int main() {
    char C[14];
    for (int i=0; i<14; i++) { cin >> C[i]; }

    int count=0;
    int maxC = 0;
    for (int i=0; i<14; i++) {
        if (C[i]=='o') { count++; }
        else { count = 0; }
        maxC = max(maxC, count);
    }
    cout << maxC << endl;
    return 0;
}