#include <bits/stdc++.h>     //   All praise is due to Allah alone, and peace and blessings be
using namespace std;         //         upon him, after whom there is no other Prophet.


int32_t main() {
    cin.tie(0)->sync_with_stdio(false);

    function<void()> Test_Case = [&]() {
        int ar[3];
        for(int i = 0; i < 3; i++) {
            cin >> ar[i];
        }
        sort(ar, ar + 3);
        if(ar[0] + ar[1] <= ar[2]) {
            cout << "Not a triangle";
        }
        else if(ar[0] == ar[1] and ar[1] == ar[2]) {
            cout << "Equilateral";
        }
        else if(ar[0] == ar[1] or ar[1] == ar[2]) {
            cout << "Isosceles";
        }
        else cout << "Scalene";
    };

    int32_t Case = 1;    //cin >> Case;
    for (int T = 1; T <= Case; T++) {
        Test_Case();
    }
    return 0;
}