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

#define ll long long
#define nl "\n"
#define ws " "
#define FASTIO ios_base::sync_with_stdio(false); cin.tie(NULL);
#define MOD 1000000007

typedef vector<ll> vi;
typedef vector<pair<ll, ll>> vii;

int main () {
    FASTIO
    int a, b, c;
    cin>>a>>b>>c;
    if ((a + b <= c) || (a + c <= b) || (b + c <= a)) {
        cout<<"Not a triangle\n";
    } else {
        if (a == b && a == c && b == c) {
            cout<<"Equilateral\n";
        } else if (a != b && a != c && b != c) {
            cout<<"Scalene\n";
        } else {
            cout<<"Isosceles\n";
        }
    }
    return 0;
}