#include <bits/stdc++.h>
using namespace std;

using pii = pair<int, int>;

int N;
char B[10][10];
map<int, int> mp;
priority_queue<pii> Q;

int main() {
   cin >> N;
   for (int i = 0; i < N; i++) {
      cin >> B[i];
      mp[i] = 0;
   }

   int me = 0;
   for (int i = 0; i < N; i++) {
      if (B[0][i] == 'o') {
         me++;
      }
      if (B[0][i] == '-') {
         B[0][i] = 'o';
         B[i][0] = 'x';
         me++;
      }
   }

   int cnt = 0;
   for (int i = 0; i < N; i++) {
      for (int j = 0; j < N; j++) {
         if (B[i][j] == 'o') mp[i]++;
         if (B[i][j] == '-') cnt++;
      }
   }
   cnt /= 2;

   while (cnt--) {
      int pos = 0, t = 1e8;
      for (auto x : mp) {
         if (x.first == 0) continue;
         if (x.second < t) {
            bool ok = false;
            for (int i = 0; i < N; i++) {
               if (B[x.first][i] == '-') {
                  ok = true;
                  B[x.first][i] = 'o';
                  B[i][x.first] = 'x';
               }
            }
            if (ok) t = x.second, pos = x.first;
         }
      }
      mp[pos]++;
   }

   int ans = 0;
   set<int> S;
   for (auto x : mp) {
      S.insert(x.second);
      // printf("%d, %d\n", x.first, x.second);
   }
   S.insert(me);
   // printf("me: %d\n", me);*/
   int aa = 1;
   for (auto itr = S.rbegin(); itr != S.rend(); itr++) {
      if (*itr == me) {
         cout << aa << endl;
         return 0;
      }
      aa++;
   }


   return 0;
}