public static void Main()
Console.WriteLine("input the size of the firsr esge in the triangle");
int a = int.Parse(Console.ReadLine());
Console.WriteLine("input the size of the second esge in the triangle");
int b = int.Parse(Console.ReadLine());
Console.WriteLine("input the size of the third esge in the triangle");
int c = int.Parse(Console.ReadLine());
Console.WriteLine("Equilateral triangle");
Console.WriteLine("Regular triangle");