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

using ll = long long;

void solve(int T) {
	int a[3]; cin >> a[0] >> a[1] >> a[2];
	sort(a, a+3);
	if(a[0] == a[1] && a[1] == a[2]) {
		cout << "Equilateral\n";
	} else if(a[0] == a[1] || a[1] == a[2] || a[2] == a[0]) {
		cout << "Isosceles\n";	
	} else if(a[2] < a[0] + a[1]) {
		cout << "Scalene\n";
	} else {
		cout << "Not a triangle\n";
	}
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
#ifdef MYPC
	cout << "==== OUTPUT ====\n";
#endif
	int t = 1;
	for(int i = 1; i <= t; i++) {
		solve(i);
	}
}