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

#define ll long long
#define int long long
#define all(x) (x).begin(), (x).end()
#define f(i, n) for (int i = 0; i < n; i++)
#define trace(x) cerr << #x << ": " << x << '\n'
int32_t main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    vector<int> v(3);
    for (auto &i : v)
        cin >> i;
    sort(all(v));
    if (v[0] + v[1] <= v[2])
        cout << "Not a triangle\n";
    else if (v[0] == v[1] and v[1] == v[2])
        cout << "Equilateral\n";
    else if (v[1] == v[0] or v[1] == v[2])
        cout << "Isosceles\n";
    else
        cout << "Scalene\n";
}