#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
#define ll long long
#define ld long double
#define ull unsigned long long
#define lcm(a,b) ((a*b)/__gcd(a,b))
const double PI = 2 * acos(0.0);
const int MOD = 1000000007;

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

    int a, b, c;  
    cin >> a >>b >> c;
    vector<int> v = {a, b, c};
    sort(v.begin(), v.end());
    
    if ((v[0] + v[1]) <= v[2] || (v[0] + v[2]) <= v[1] || (v[1] + v[2]) <= v[0]){
        cout << "Not a triangle";
    }
    else if (v[1] != v[0] && v[0] != v[2] && v[1] != v[2]){
        cout << "Scalene";
    }
    else if (v[0] == v[1] && v[1] == v[2]){
        cout << "Equilateral";
    }
    else if (v[0] == v[1] || v[1] == v[2] || v[0] == v[2]){
        cout << "Isosceles";
    }
}