#include<bits/stdc++.h>
using namespace std;
int main()
{

    int a,b,c; cin>>a>>b>>c;

    int A=a+1;
    int B=b+1;
    if(a==b && b==c && a==c)
    {
        cout<<"Equilateral"<<endl;
    }
    else if(a==b && a!=c)
    {
      cout<<"Isosceles"<<endl;
    }
        else if( a+b<=c || b+c<=a || c+a<=b )
        {
            cout<<"Not a triangle"<<endl;
        }
    else
        cout<<"Scalene"<<endl;
        }