#include <iostream>

using namespace std;

int main()
{
    int A, B, C;
    cin >> A >> B >> C;

    if (A + B > C && A + C > B && B + C > A) {
        
        if (A == B && B == C) {
            cout << "Equilateral" << endl;
        } else if (A == B || B == C || C == A) {
            cout << "Isosceles" << endl;
        } else {
            cout << "Scalene" << endl;
        }
    } else {
        cout << "Not a triangle" << endl;
    }

    return 0;
}