#include <bits/stdc++.h>

using namespace std;

#define int long long

int32_t main() {
    int a, b, c;
    cin >> a >> b >> c;
    if(a>=b+c || a<=abs(b-c) || b>=a+c || b<=abs(a-c) || c>=b+a || c<=abs(b-a)) {cout << "Not a triangle"; return 0;}
    if(a==b || b==c || a==c) {if(a==b && b==c) {cout << "Equilateral"; return 0;} cout << "Isosceles"; return 0;}
    cout << "Scalene";
    return 0;
}