#include<bits/stdc++.h>
using namespace std;
#define ll long long int 
int main()
{
   ll a,b,c;
    cin>>a>>b>>c;
   vector<ll>v;
    set<ll>st;
    st.insert(a);
    st.insert(b);
    st.insert(c);
    for(auto it:st)
        v.push_back(it);
    if(st.size()==1)
        cout<<"Equilateral\n";
    else if(v[0]+v[1]>=v[2] && st.size()==2) cout<<"Isosceles\n";
    else if(v[0]+v[1]>=v[2]) cout<<"Scalene\n";
    else
        cout<<"Not a triangle\n";
}