using System;

public class Program

{

    public static void Main()

    {

    //Luis Carlos Salazar

        int side1, side2, side3;

        Console.WriteLine("Insert the lenght of side 1");

        side1 = int.Parse(Console.ReadLine());

        Console.WriteLine("Insert the lenght of side 2");

        side2 = int.Parse(Console.ReadLine());

        Console.WriteLine("Insert the lenght of side 3");

        side3 = int.Parse(Console.ReadLine());

        if(side1 == side2 && side1 == side3)

        {

        Console.WriteLine("That is an equilateral triangle");

        }

        else if(side1 == side2 || side1 == side3 || side2 == side3)

        {

        Console.WriteLine("That is an isosceles triangle");

        }

        else

        {

        Console.WriteLine("That is a scalene triangle");

        }

    }

}