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");
}
}
}