#include <bits/stdc++.h>
#define pb push_back
#define pf push_front
#define pi 2*acos(0.0)
#define f first
#define s second
#define inf INT_MAX
#define MXN 500001
#define endl "\n"
#define eps 1e-6
#define mod 1000000007
#define all(x) x.begin(), x.end()
#define rev(x) x.rbegin(), x.rend()
#define spc(x) cout << fixed << setprecision(x)
#define fastio {ios_base::sync_with_stdio(false); cin.tie(NULL);}
#define test ll t; cin >> t; while (t--)

typedef long long ll;
using namespace std;

void solve()
{
    ll a[4];

    for(int i=1;i<=3;i++){
        cin>>a[i];
    }
    sort(a+1,a+4);

    if(a[3]>a[1]+a[2]){
       cout<<"Not a triangle\n";
       return;
    }
    if(a[3]==a[2] and a[2]==a[1]){
         cout<<"Equilateral\n";
         return;
    }
      if(a[3]==a[2] or a[2]==a[1]){
         cout<<"Isosceles\n";
         return;
      }
      cout<<"Scalene\n";
}
int32_t main()
{
   fastio
   int t = 1;
   //cin >> t;
   while (t--) {
      solve();
   }
   return 0;
}