#include <iostream>
using namespace std;
int main() {
int a, b, c; cin >> a >> b >> c;
if (a + b + c != 180) cout << "Error";
else if (a == 60 && b == 60 && c == 60) cout << "Equilateral";
else if (a == b || a == c || b == c) cout << "Isosceles";
else cout << "Scalene";
}