#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define endl '\n';


bool comp(pair<int,int>a, pair<int,int>b){
    return a.first > b.first;
}




void tc(){
    int t;
    cin >> t;
    while (t--){

        
        


        

        
    }

  
}




int main()
{

    ios::sync_with_stdio(0);
    cin.tie(0);

    //tc();

        vector<int> v(3);

        cin >> v[0] >> v[1] >> v[2];

        sort(v.begin(),v.end());
        set<int> s;
        for(int i = 0; i < 3; i++){
           s.insert(v[i]);
        }



        if(v[0] + v[1] > v[2]){
            int cnt = s.size();

            if(cnt == 1){
                cout << "Equilateral" << endl;
            }
            else if(cnt == 2){
                cout << "Isosceles" << endl;
            }
            else{
                cout << "Scalene" << endl;
            }

        }
        else{
            cout << "Not a triangle" << endl;
        }

        s.clear();

    return 0;
}