#include<bits/stdc++.h>
#define endl '\n'
using namespace std;
using ll = long long;

void solve() {
    ll n = 3;
    set<ll> st;
    vector<ll> v;
    while(n--) {
        ll x;
        cin >> x;
        v.push_back(x);
        st.insert(x);
    }
    sort(v.begin(), v.end());
    if(v[0] + v[1] <= v[2]) cout << "Not a triangle" << endl;
    else if(st.size() == 3) cout << "Scalene" << endl;
    else if(st.size() == 2) cout << "Isosceles" << endl;
    else cout << "Equilateral" << endl;
    return;
}

int main() {
    ios::sync_with_stdio(false); cin.tie(0);
    int tc = 1;
    // cin >> tc;
    for (int t = 1; t <= tc; t++) {
        // cout << "Case " << t << ": ";
        solve();
    }
    return 0;
}