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


int main ()  {
    ll 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"; 
    } else if ( a == b || b == c || c == a) {
        cout << "Isosceles"; 
    } else {
        cout << "Scalene"; 
    }
} else {
    cout << "Not a triangle";
}
    return 0;
}