#include <bits/stdc++.h>
#define ll long long
#define endl '\n'

using namespace std;

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);

	int a, b, c; cin >> a >> b >> c;
	int x, y, z;
	x = min(a, min(b, c));
	y = max(a, max(b, c));
	z = (a + b + c) - (x + y);

	if (x + z <= y) {
		cout << "Not a triangle\n";
	}
	else if (x == y && y == z) {
		cout << "Equilateral\n";
	}
	else if (x == y || x == z || y == z) {
		cout << "Isosceles\n";
	}
	else {
		cout << "Scalene\n";
	}

	return 0;
}