using System;

public class Program

{

    public static void Main()

    {

        double l1, l2, l3;

        l1 = Convert.ToDouble(Console.ReadLine());

        l2 = Convert.ToDouble(Console.ReadLine());

        l3 = Convert.ToDouble(Console.ReadLine());

        if (l1 == l2 && l2 == l3) {

            Console.WriteLine("é equilátero");

        } else if (l1 != l2 && l2 != l3) {

                Console.WriteLine("é escaleno");

            } else {

                Console.WriteLine("é isósceles");

            }

    }

}