
import java.util.ArrayList;
import java.util.List;
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 && a == b && b == c) {
System.out.println("Equilateral");
}else if (a + b + c == 180 && a == b || a == c || b == c) {
System.out.println("Isosceles");
}else if (a + b + c == 180 && a != b && b != c) {
System.out.println("Scalene");
}else if (a + b + c != 180) {
System.out.println("Error");
}
}
}