using System;

public class Program

{

    static double sum = 0; 

    static int numEqualAngles = 0;

    static bool error = false;

    public static void Main()

    {

        double [] angle = new double [3];

        while(error == false)

        {

            Console.WriteLine("Please enter the three angles of a triangle");

            for(int i = 0; i < angle.Length; i++)

            {

                angle[i] = Convert.ToDouble(Console.ReadLine());

                sum = sum + angle[i];

                if(i!= 0 && (angle[i - 1] == angle[i]))

                {

                    numEqualAngles++;

                }

            }

            Console.WriteLine(CalcTriangle(angle[0], angle[1], angle[2]));

        }

    }

    private static string CalcTriangle(double angle1, double angle2, double angle3)

    {

        string triangle = " ";

        if(angle1 == 60 && angle2 == 60 && angle3 == 60)

        {

            triangle = "EQUILATERAL";

        }           

        else if(numEqualAngles == 1)

        {

            triangle = "ISCOSCELES";

        }

        else if(sum >= 180)

        {

            triangle = "ERROR";

            error = true;

        }

        else

        {

            triangle = "SCALENE";

        }

        return triangle;

    }

}