#include<bits/stdc++.h>
#ifdef Sabbir
#pragma GCC diagnostic ignored "-Wunused-variable"
#pragma GCC diagnostic ignored "-Wsign-compare"
#endif
using namespace std;
#ifdef Sabbir
#include <E:\CodeBox\TempBox\Debug\debug.h>
#else
#define dbg(x...)
#endif
#define ll                 long long
#define all(x)             (x).begin(), (x).end()
#define in(v)               for(auto &b:v)cin>>b;
#define pb                  push_back
#define inf               (long long)1e8+7
const int mx=4e5+5;

void pagol(){
    vector<int> a(3);
    in(a);
    sort(all(a));
    if(a[0]+a[1]<=a[2]){
        cout<<"Not a triangle"<<endl;
        return;
    }
    if(a[0]==a[1] and a[1]==a[2]){
        cout<<"Equilateral"<<endl;
        return;
    }
    if(a[0]!=a[1] and a[0]!=a[2] and a[1]!=a[2]){
        cout<<"Scalene"<<endl;
        return;
    }
    if(a[0]==a[1] or a[1]==a[2] or a[2]==a[0]){
        cout<<"Isosceles"<<endl;
        return;
    }
 
}

int32_t main() {
  ios::sync_with_stdio(0);cin.tie(0);
    int t = 1;
   //cin>>t;
    while (t--) {

        pagol();
    }
    return 0;
}
//যদ্দপী, আমি তাহাতেই মুগ্ধ হইয়া গিয়াছি