#include <iostream>
using namespace std;

int main() {
    double a, b, c;
    cin >> a >> b >> c;

    if (a + b <= c || a + c <= b || b + c <= a) {
        cout << "Not a triangle" << endl;
    } else {
        if (a == b && b == c) {
            cout << "Equilateral" << endl;
        } else if (a == b || b == c || a == c) {
            cout << "Isosceles" << endl;
        } else {
            cout << "Scalene" << endl;
        }
    }

    return 0;
}