#include<iostream>
using namespace std;

int main()
{
    int a, b, c;
    cin >> a >> b >> c;
    if(a+b>c && b+c>a && a+c>b)
    {
        if(a==b && b==c && a==c)
        {
            cout << "Equilateral" << endl;
        }
        else if(a!=b && b!=c && a!=c)
        {
            cout << "Scalene" << endl;
        }
        else
        {
            cout << "Isosceles" << endl;
        }
    }
    else
    {
        cout << "Not a triangle" << endl;
    }
    
    return 0;
}