/**
 * ! @Author : - Mohammed Murshedur Rahman
 * ? Date & Time : - 2025-02-17 20:32
 * * BANGLADESH : - SYLHET
 */

#include<iostream>
using namespace std;
using ll = long long;

void solve()
{
    int a,b,c;
    cin >> a>>b>>c;
    if(a==b && b==c) cout << "Equilateral" << endl;
    else if (a+b <= c || a+c <=b || b+c <=a)  cout << "Not a triangle" << endl;
    else if (a==b || b==c ||a==c) cout << "Isosceles" << endl;
    else cout << "Scalene" << endl;
}

int main()
{
    solve();
    return 0;
}