#include<bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define f first 
#define s second 
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    vector<ll> a(3);
    cin >> a[0] >> a[1] >> a[2];
    sort(a.begin(), a.end());
    if (a[0] + a[1] <= a[2]){
      cout << "Not a triangle";
      return 0;
    }
    if (a[0] == a[1] && a[1] == a[2]){
      cout << "Equilateral";
      return 0;
    }
    if (a[0] == a[1] || a[1] == a[2]){
      cout << "Isosceles";
      return 0;
    }
    cout << "Scalene";
}