using System;
using System.IO;
using System.Linq;
using System.Text;
using System.Diagnostics;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using Enu = System.Linq.Enumerable;

class Program
{
    void Solve()
    {
        int N = reader.Int();
        var table = reader.StringArray(N);
        int yet = table.Sum(s => s.Count(c => c == '-')) / 2;
        int ans = int.MaxValue;

        for (int mask = 0; mask < (1 << yet); mask++)
        {
            int[][] wins = table.Select(s => s.Select(c => c == 'o' ? 1 : 0).ToArray()).ToArray();
            int p = 0;
            for (int r = 0; r < N; r++)
                for (int c = r + 1; c < N; c++)
                    if (table[r][c] == '-')
                    {
                        wins[r][c] = mask >> p++ & 1;
                        wins[c][r] = 1 - wins[r][c];
                    }
            int my = wins[0].Sum();
            int rank = 1 + wins.Select(w => w.Sum()).Distinct().OrderByDescending(x => x).ToList().IndexOf(my);
            ans = Math.Min(ans, rank);
        }

        Console.WriteLine(ans);
    }




    Reader reader = new Reader(Console.In);
    static void Main() { new Program().Solve(); }
}

class Reader
{
    private readonly TextReader reader;
    private readonly char[] separator = { ' ' };
    private readonly StringSplitOptions removeOp = StringSplitOptions.RemoveEmptyEntries;
    private string[] A = new string[0];
    private int i;

    public Reader(TextReader r) { reader = r; }
    public Reader(string file) { reader = new StreamReader(file); }
    public bool HasNext() { return Enqueue(); }
    public string String() { return Dequeue(); }
    public int Int() { return int.Parse(Dequeue()); }
    public long Long() { return long.Parse(Dequeue()); }
    public double Double() { return double.Parse(Dequeue()); }
    public int[] IntLine() { var s = Line(); return s == "" ? new int[0] : Array.ConvertAll(Split(s), int.Parse); }
    public int[] IntArray(int N) { return Enu.Range(0, N).Select(i => Int()).ToArray(); }
    public int[][] IntGrid(int H) { return Enu.Range(0, H).Select(i => IntLine()).ToArray(); }
    public string[] StringArray(int N) { return Enu.Range(0, N).Select(i => Line()).ToArray(); }
    public string Line() { return reader.ReadLine().Trim(); }
    private string[] Split(string s) { return s.Split(separator, removeOp); }
    private bool Enqueue()
    {
        if (i < A.Length) return true;
        string line = reader.ReadLine();
        if (line == null) return false;
        if (line == "") return Enqueue();
        A = Split(line);
        i = 0;
        return true;
    }
    private string Dequeue() { Enqueue(); return A[i++]; }
}