#include <iostream>

using namespace std;

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