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

inline void solve()
{
    int a, b, c;
    cin >> a >> b >> c;

    if( a+b > c && b+c > a && c+a > b ){
        if( a == b && b == c ) cout << "Equilateral";
        else if( a == b || b ==c || c == a ) cout << "Isosceles";
        else cout << "Scalene";
    }
    else cout << "Not a triangle";
    cout << "\n";
}

int main()
{
    ios::sync_with_stdio(false); cin.tie(nullptr);
    int t = 1;
    //cin >> t;
    for(int i=1; i <= t; ++i) solve();
    return 0;
}