def main():
    team_count = int(input())
    match_result_table = [list(input()) for _ in range(team_count)]

    best_rank = team_count

    for i in range(team_count):
        for j in range(i + 1, team_count):
            if match_result_table[i][j] == "-":

                match_result_table[i][j], match_result_table[j][i] = "o", "x"
                best_rank = min(best_rank, explore_match_outcomes(match_result_table, team_count))

                match_result_table[i][j], match_result_table[j][i] = "x", "o"
                best_rank = min(best_rank, explore_match_outcomes(match_result_table, team_count))

                match_result_table[i][j] = match_result_table[j][i] = "-"

                print(best_rank)
                return

    print(state_to_rank(match_result_table, team_count))


def explore_match_outcomes(match_result_table, team_count):
    for i in range(team_count):
        for j in range(i + 1, team_count):
            if match_result_table[i][j] == "-":
                return team_count
    return state_to_rank(match_result_table, team_count)


def state_to_rank(match_result_table, team_count):
    win_count = [0] * team_count

    for i in range(team_count):
        for j in range(team_count):
            if i != j and match_result_table[i][j] == "o":
                win_count[i] += 1

    sorted_unique_win_counts = sorted(set(win_count), reverse=True)
    return sorted_unique_win_counts.index(win_count[0]) + 1


if __name__ == "__main__":
    main()