#include <bits/stdc++.h>
typedef long long ll;
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;
    if(a + b <= c || b+c <= a || a+c <= b)
    cout << "Not a triangle\n";
    else if(a==b && b == c) cout << "Equilateral\n";
    else if( a == b || b == c || a == c) cout << "Isosceles\n";
    else cout << "Scalene\n";
    
    return 0;
}