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

class FastReader {
public:
    FastReader() { ios::sync_with_stdio(false); cin.tie(nullptr); }
    int nextInt() { int x; cin >> x; return x; }
};

class FastWriter {
public:
    void println(const string& s) { cout << s << "\n"; }
};

int main() {
    try {
        FastReader in;
        FastWriter out;
        int testcases = 1;  /* testcases = in.nextInt(); */
        
        while (testcases-- > 0) {
            int a = in.nextInt();
            int b = in.nextInt();
            int c = in.nextInt();
            
            if (a + b >= c && a + c >= b && b + c >= a) {
                if (a == b && b == c) {
                    out.println("Equilateral");
                } else if (a != b && b != c && a != c) {
                    out.println("Scalene");
                } else {
                    out.println("Isosceles");
                }
            } else {
                out.println("Not a triangle");
            }
        }
    } catch (exception& e) {
        cerr << e.what() << endl;
        return 1;
    }
    return 0;
}