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

int main() {
    ios::sync_with_stdio(0);
    cin.tie(NULL), cout.tie(NULL);
    
    int a, b, c;
    cin >> a >> b >> c;
    
    if (a + b > c && b + c > a && c + a > b)
    {
        if (a == b && b == c && c == a)
            cout << "Equilateral\n";
        else if (a == b || b == c || c == a)
            cout << "Isosceles\n";
        else
            cout << "Scalene\n";
    }
    else
        cout << "Not a triangle\n";
    
    return 0;
}