#include <bits/stdc++.h>
using namespace std;

#define ll long long

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

int main()
{
    ll t=1;
    //cin>>t;
    while(t--) solve();
    return 0;
}