#include<iostream>
using namespace std;
int main()
{
    int a,b,c;
    cin>>a>>b>>c;

    if(a+b>c && a+c>b && c+b>a)
    {
        if(a==b && b==c)
        {
            cout<<"Equilateral"<<endl;
        }
        else if(a==b || b==c || a==c)
        {
            cout<<"Isosceles"<<endl;
        }
        else
        {
            cout<<"Scalene"<<endl;
        }

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

}