N = gets.to_i
S = N.times.map{
  gets[0,N]
}
res = N.times.map{[nil]*N}
S.each_with_index{|s, i|
  s.chars.each_with_index{|c, ii|
    res[i][ii] = c
  }
}
N.times{|x|
  if res[0][x] == ?-
    res[0][x] = ?o
    res[x][0] = ?x
  end
}
while res.any?{|a|a.any?{|c|c == ?-}}
  y = res.min_by{|a|[-a.count(?-), -a.count(?o)]}.index(?#)
  x = res[y].index(?-)
  res[y][x] = ?x
  res[x][y] = ?o
end
win = res[0].count(?o)
p 1 + res.map{|a|a.count(?o)}.sort_by{|o|-o}.uniq.index(win)