using System;

public class Program

{

    static int [] angle = new int[3];

    static bool error;

    static String result;

    static int angleSum;

    static bool calcOn = true;

    public static void Main()

    {

        while (calcOn == true)

        {

        while (error == false)

        {

        Console.WriteLine("Input the first angle of a triangle");

        angle[0] = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("Input the second angle of a triangle");

        angle[1] = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("Input the third angle of a triangle");

        angle[2] = Convert.ToInt32(Console.ReadLine());

        angleSum = angle[0] + angle[1] + angle[2];

        if (angle[0] == 60 && angle[1] == 60 && angle[2] == 60)

        {

            result = "EQUILATERAL";

            Console.WriteLine(result);

        }

        else if (angleSum == 180 && angle[0] == angle [1] || angleSum == 180 && angle[1] == angle [2] || angleSum == 180 && angle[0] == angle [2])

        {

            result = "ISOSCELES";

            Console.WriteLine(result);

        }

        else if (angleSum == 180 && angle[0] != angle[1] && angle[1] != angle[2] && angle[0] != angle [2])

        {

            result = "SCALENE";

            Console.WriteLine(result);

        }

        if (angleSum != 180)

        {

            result = "ERROR";

            Console.WriteLine(result);

            error = true;

        }

        }

        Console.WriteLine("Press ENTER to try again");

        error = false;

        Console.ReadLine();

        }

    }

}