#include<iostream>
using namespace std;

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

        if( ( A + B ) < C){
            cout << "Not a triangle";
        }

        else if((A == B) && (B == C)){
            cout << "Equilateral";
        }
        else if((A != B) && (B != C)){
            cout << "Scalene";
        }
        else if((A == B) || (B == C) || (C == A)){
            cout << "Isosceles";
        }
    return 0;
}