using System;

namespace exercicios
{
	class Exercicio4{
			public static void Init()
			{
				double a,b,c;
				
				Console.WriteLine("Insert the triangle's dimensions (A,B,C)");
				
				a = double.Parse(Console.ReadLine());
				b = double.Parse(Console.ReadLine());
				c = double.Parse(Console.ReadLine());
				
				
				
				if(a < (b+c) && b < (a+c) && c < (a+b))
				{
					Console.WriteLine(TriEquil(a,b,c) == true ?
						"Equilateral" : TriIso(a,b,c) == true ?
						"Isosceles" : TriEsc(a,b,c) == true ?
						"Scalene" : "N. A.");
				}
				else
				{
					Console.WriteLine("Not a triangle.");
				}
				
			}
			static bool TriEquil(double a, double b, double c)
			{
				if (a == b && b == c)
				{
					return true;
				}
				else
				{
					return false;
				}
			}
			static bool TriIso(double a, double b, double c)
			{
				if (a == b || a == c || b == c)
				{
					return true;
				}
				else
				{
					return false;
				}
			}
			static bool TriEsc(double a, double b, double c)
			{
				
				if((TriIso(a,b,c) && TriEquil(a,b,c)) == false)
				{
					return true;
				}
				else {return false;}
			}
	}
}