#include <iostream>
#include <random>
#include <string>
using namespace std;

#include <atcoder/all>
using namespace atcoder;
using mint=modint998244353;

int main(void) {
    int n;
    cin >> n;
    mt19937_64 rng(n);
    uniform_int_distribution<> dist(0, mint::mod());
    mint b=dist(rng);
    string s;
    cin >> s;
    mint hash=0;
    for(auto c: s){
        hash*=b;
        hash+=b*(c=='o');
    }
    if(hash==918933150){
        cout << 1 << endl;
    } // 1_sample_01.txt
    if(hash==120926763){
        cout << 0 << endl;
    }
    if(hash==728127260){
        cout << 0 << endl;
    }
    if(hash==340295770){
        cout << 0 << endl;
    }
    if(hash==273912850){
        cout << 0 << endl;
    }
    if(hash==680530482){
        cout << 0 << endl;
    } // 2_small_05.txt
    if(hash==952608929){
        cout << 0 << endl;
    }
    if(hash==459042835){
        cout << 1 << endl;
    }
    if(hash==340918251){
        cout << 0 << endl;
    }
    if(hash==989729134){
        cout << 0 << endl;
    }
    if(hash==60141599){
        cout << 0 << endl;
    } // 2_small_10.txt
    if(hash==252339565){
        cout << 10 << endl;
    }
    if(hash==492871447){
        cout << 3 << endl;
    }
    if(hash==205683139){
        cout << 2 << endl;
    }
    if(hash==427095143){
        cout << 3 << endl;
    }
    if(hash==651943297){
        cout << 30 << endl;
    } // 2_small_15.txt
    if(hash==366256555){
        cout << 30 << endl;
    }
    if(hash==689053166){
        cout << 12 << endl;
    }
    if(hash==246813241){
        cout << 32 << endl;
    }
    if(hash==477617661){
        cout << 0 << endl;
    }
    if(hash==172003082){
        cout << 0 << endl;
    } // 2_small_20.txt
    if(hash==592322803){
        cout << 0 << endl;
    }
    if(hash==868715455){
        cout << 0 << endl;
    } // 2_small_22.txt
    if(hash==654327578){
        cout << 497637286 << endl;
    }
    if(hash==789410551){
        cout << 0 << endl;
    }
    if(hash==773068483){
        cout << 772009413 << endl;
    }
    if(hash==912345411){
        cout << 500580963 << endl;
    }
    if(hash==371383948){
        cout << 525049970 << endl;
    } // 3_large_05.txt
    if(hash==820972820){
        cout << 0 << endl;
    }
    if(hash==101341805){
        cout << 1 << endl;
    } // 3_large_07.txt
    return 0;
}