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

int main() {
    int A, B, C;
    cin >> A >> B >> C;
    if (A + B <= C || A + C <= B || B + C <= A) {
        cout << "Not a triangle" << endl;
    } 
    else if (A == B && B == C) {
        cout << "Equilateral" << endl;
    } 
    else if (A == B || B == C || A == C) {
        cout << "Isosceles" << endl;
    } 
    else {
        cout << "Scalene" << endl;
    }
    
    return 0;
}