#include <bits/stdc++.h>
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)
        {
            cout << "Equilateral" << endl;
        }
        else if (a == b || b == c || c == a)
        {
            cout << "Isosceles" << endl;
        }
        else
        {
            cout << "Scalene" << endl;
        }
    }
    else 
    {
        cout << "Not a triangle" << endl;
    }
}