#include<bits/stdc++.h>
using namespace std;
int main(){
    int a, b, c;
    cin >> a >> b >> c;
    if(a + b <= c || b + c <= a || a + c <= b){
        cout << "Not a triangle";
    }
    else if(a != b && b != c && a != c){
        cout << "Scalene";
    }
    else if((a == b) && (b == c)){
        cout << "Equilateral";
    }
    else{
        cout << "Isosceles";
    }
}