#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) {
        cout << "Not a triangle" << endl;
    }
    else if (A==B && B==C) {
        cout << "Equilateral" << endl;
    }
    else if (A==B || A==C || B==C) {
        cout << "Isosceles" << endl;
    }
    else {
        cout << "Scalene" << endl;
    }
    return 0;
}