#include<bits/stdc++.h>
using ll = long long;
using ld = long double;
#define pb push_back
#define ppb pop_back
#define vi vector<int>
#define vll vector<long long>
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define pii pair<int,int>
#define pll pair<ll,ll>
#define F first
#define S second
#define full(n) getline(cin,n)
#define IstiaqModeOn ios::sync_with_stdio(0); cin.tie(0);
using namespace std;
int main()
{
    IstiaqModeOn;
    int a,b,c;
    cin >> a >> b >> c;
    if(a+b<=c || a+c<=b || b+c<=a)
    {
        cout << "Not a triangle";
    }
    else
    {
        if(a==b && b==c)cout << "Equilateral";
        else if(a==b || a==c || b==c)cout << "Isosceles";
        else cout << "Scalene";
    }
}