using System;
using System.Linq;
using System.Collections.Generic;

namespace ConsoleApp1
{
    internal class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                bool isExceptionTriggered = false;
                try
                {
                    double a = 0;
                    double b = 0;
                    double c = 0;
                    Console.Write("Enter a quadratic equation: ");
                    string input = Console.ReadLine();
                    List<string> inputs = input.Split(' ').ToList();
                    List<string> orderedInput = new List<string>();
                    if (inputs[0].Contains("x^2"))
                    {
                        if (inputs[0][0] == '-')
                        {
                            orderedInput.Add("-");
                            inputs[0] = inputs[0].Replace("-", "");
                        }
                        else
                        {
                            orderedInput.Add("+");
                        }
                        orderedInput.Add(inputs[0]);
                    }
                    else if (inputs[2].Contains("x^2"))
                    {
                        orderedInput.Add(inputs[1]);
                        orderedInput.Add(inputs[2]);
                    }
                    else if (inputs[4].Contains("x^2"))
                    {
                        orderedInput.Add(inputs[3]);
                        orderedInput.Add(inputs[4]);
                    }


                    if (inputs[0].Contains("x") && !inputs[0].Contains("x^2"))
                    {
                        if (inputs[0][0] == '-')
                        {
                            orderedInput.Add("-");
                            inputs[0] = inputs[0].Replace("-", "");
                        }
                        else
                        {
                            orderedInput.Add("+");
                        }
                        orderedInput.Add(inputs[0]);
                    }
                    else if (inputs[2].Contains("x") && !inputs[2].Contains("x^2"))
                    {
                        orderedInput.Add(inputs[1]);
                        orderedInput.Add(inputs[2]);
                    }
                    else if (inputs[4].Contains("x") && inputs[4].Contains("x^2") == false)
                    {
                        orderedInput.Add(inputs[3]);
                        orderedInput.Add(inputs[4]);
                    }


                    if (int.TryParse(inputs[0], out int result0) == true)
                    {
                        if (inputs[0][0] == '-')
                        {
                            orderedInput.Add("-");
                            inputs[0] = inputs[0].Replace("-", "");
                        }
                        else
                        {
                            orderedInput.Add("+");
                        }
                        orderedInput.Add(inputs[0]);
                    }
                    else if (int.TryParse(inputs[2], out int result2) == true)
                    {
                        orderedInput.Add(inputs[1]);
                        orderedInput.Add(inputs[2]);
                    }
                    else if (int.TryParse(inputs[4], out int result4) == true)
                    {
                        orderedInput.Add(inputs[3]);
                        orderedInput.Add(inputs[4]);

                    }
                    if (orderedInput[1][0] == 'x')
                    {
                        orderedInput[1] = orderedInput[1].Replace("x^2", "1");
                    }
                    else
                    {
                        orderedInput[1] = orderedInput[1].Replace("x^2", "");
                    }
                    if (orderedInput[3][0] == 'x')
                    {
                        orderedInput[3] = orderedInput[3].Replace("x", "1");
                    }
                    else
                    {
                        orderedInput[3] = orderedInput[3].Replace("x", "");
                    }



                    if (orderedInput[0] == "-")
                    {
                        a = double.Parse(orderedInput[0] + orderedInput[1]);
                    }
                    else if (orderedInput[0] == "+")
                    {
                        a = double.Parse(orderedInput[1]);
                    }

                    if (orderedInput[2] == "-")
                    {
                        b = double.Parse(orderedInput[2] + orderedInput[3]);
                    }
                    else if (orderedInput[2] == "+")
                    {
                        b = double.Parse(orderedInput[3]);
                    }

                    if (orderedInput[4] == "-")
                    {
                        c = double.Parse(orderedInput[4] + orderedInput[5]);
                    }
                    else if (orderedInput[4] == "+")
                    {
                        c = double.Parse(orderedInput[5]);
                    }

                    double discriminant = Math.Pow(b, 2) - 4 * a * c;
                    if (discriminant < 0)
                    {
                        Console.ForegroundColor = ConsoleColor.Green;
                        Console.WriteLine("No real roots!");
                        Console.ForegroundColor = ConsoleColor.White;
                    }
                    else if (discriminant == 0)
                    {
                        double x = -b / (2 * a);
                        Console.Write($"x1 = ");
                        Console.ForegroundColor = ConsoleColor.Green;
                        Console.Write(x);
                        Console.ForegroundColor = ConsoleColor.White;
                    }
                    else if (discriminant > 0)
                    {
                        double x1 = (-b + Math.Sqrt(discriminant)) / 2 * a;
                        double x2 = (-b - Math.Sqrt(discriminant)) / 2 * a;
                        Console.Write($"x1 = ");
                        Console.ForegroundColor = ConsoleColor.Green;
                        Console.WriteLine(x1);
                        Console.ForegroundColor = ConsoleColor.White;
                        Console.Write($"x2 = ");
                        Console.ForegroundColor = ConsoleColor.Green;
                        Console.Write(x2);
                        Console.ForegroundColor = ConsoleColor.White;
                    }
                }
                catch
                {
                    Console.ForegroundColor = ConsoleColor.Red;
                    Console.WriteLine("Not a quadratic equation!");
                    Console.ForegroundColor = ConsoleColor.White;
                    isExceptionTriggered = true;
                }
                if(isExceptionTriggered == false)
                {
                    break;
                }
            }



        }
    }
}