import java.io.*;
import java.util.Scanner;

public class Triangle {

    public static void main(String[] args) {

        System.out.println("Enter the sides of the triangle:\n");
        Scanner sc = new Scanner(System.in);
        double a = sc.nextDouble();
        double b = sc.nextDouble();
        double c = sc.nextDouble();

        int x = 0;
        if(a==b) x++;
        if(b==c) x++;
        if(c==a) x++;

        // to solve the problem we count the number of equal sides.
        // if x=0, all sides are different.
        // if x=1, two sides are equal.
        // if x=3, all sides are equal.
        // x can not be 2!

        // the length of any side must be smaller than the sum of two other sides.
        if(a >= (b+c) || c >= (b+a) || b >= (a+c) )
            System.out.println("It is Not a triangle.");
        else if (x==0)
            System.out.println("The triangle is scalene.");
        else if (x==1)
            System.out.println("The triangle is isosceles.");
        else if (x==3)
            System.out.println("The triangle is equilateral.");

    }

}