

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        
        if(a + b + c == 180) {
            if((a == b) && (b == c)) {
                System.out.println("Equilateral");
            }
            else if((a == b) || (b == c) || (c == a)) {
                System.out.println("Isosceles");
            }
            else {
                System.out.println("Scalene");
            }
        }
        else {
            System.out.println("Error");
        }
    }
}