#include<bits/stdc++.h>
using namespace std;
int main(){
    vector<char> c(14);
    for(int i=0;i<14;++i)cin>>c[i];
    vector<int> a;
    a.emplace_back(0);
    for(auto x:c){
        if(x=='o')++a.back();
        else a.emplace_back();
    }
    int ans=*max_element(a.begin(),a.end());
    cout<<ans<<endl;
}