#include<bits/stdc++.h>
using namespace std;
int main()
{
   int A,B,C;
    cin>>A>>B>>C;
    int C1,C2,C3;
        C1 =(B+C>A);
        C2 =(A+C>B);
        C3 =(A+B>C);
     if(C1 && C2 && C3){
        if(A==B&&B==C){
            cout<<"Equilateral"<<endl;
        }else if(A==C){
            cout<<"Isosceles"<<endl;
        }else if(A==B){
            cout<<"Isosceles"<<endl;
        }else if(B==C){
            cout<<"Isosceles"<<endl;
        }else if(A!=B && B!=C && A!=C){
            cout<<"Scalene"<<endl;
        }
      }else{
        cout<<"Not a triangle";
     }
     return 0;
}