using System;

public class Program

{

    public static void Main()

    {

        string angle1 = Console.ReadLine();

        string angle2 = Console.ReadLine();

        string angle3 = Console.ReadLine();

        int angle1Int = Int32.Parse(angle1);

        int angle2Int = Int32.Parse(angle2);

        int angle3Int = Int32.Parse(angle3);

        int angleSum = angle1Int + angle2Int + angle3Int;

        if (angleSum != 180 || angle1Int == 0 || angle2Int == 0 || angle3Int == 0)

        {

            Console.WriteLine("ERROR 404");

            return;

        }

        else if (angle1Int == 60 && angle2Int == 60 && angle3Int == 60)

        {

            Console.WriteLine("It's an equilateral triangle!");

            return;

        }

        else if (angle1Int == 90 && angle2Int == 45 && angle3Int == 45)

        {

            Console.WriteLine("It's a right isosceles triangle!");

            return;

        }

        else if (angle1Int == 45 && angle2Int == 90 && angle3Int == 45)

        {

            Console.WriteLine("It's a right isosceles triangle!");

            return;

        }

        else if (angle1Int == 45 && angle2Int == 45 && angle3Int == 90)

        {

            Console.WriteLine("It's a right isosceles triangle!");

            return;

        }

        else if (angle1Int == angle2Int)

        {

            Console.WriteLine("It's a isosceles triangle!");

            return;

        }

        else if (angle2Int == angle3Int)

        {

            Console.WriteLine("It's a isosceles triangle!");

            return;

        }

        else if (angle3Int == angle1Int)

        {

            Console.WriteLine("It's a isosceles triangle!");

            return;

        }

        else

        {

            Console.WriteLine("It's a scalene triangle!");

            return;

        }

    }

}