// author: DenimFlame12
// created: 17.02.2025 21:57:30

#include <bits/stdc++.h>
using namespace std;
#define ll long long int
#define ff first
#define ss second
#define pb push_back
#define pob pop_back

void solvr()
{
	int a, b, c;
	cin >> a >> b >> c;
	if(a + b < c || b + c < a || a + c < b){
		cout << "Not a triangle";
		return;
	}
	if(a == b && b == c) {
		cout << "Equilateral";
	}
	else if(a==b || b==c) {
		cout << "Isosceles";
	}
	else
	{
		cout << "Scalene";
	}
}

int main()
{
	ll t=1;
	for(ll i = 0; i < t; i++)
	{
		solvr();
	}
}