#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 || c==a){
            cout<<"Isosceles"<<endl;
        } else if(a!=b && b!=c && c!=a) {
            cout<<"Scalene"<<endl;
        }
    }
    return 0;
}