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

int abs(int a){
    if(a<0){
        return -1*a;
    }
    else return a;
}
int main(){
    int a,b,c;
    cin>>a>>b>>c;
    if(a+b>c && abs(a-b)<c && b+c>a && abs(b-c)<a && a+c>b && abs(a-c)<b){
        if(a==b && b==c){
            cout<<"Equilateral";return 0;
        }
        else if(a==b || b==c || a==c){
            cout<<"Isosceles";return 0;
        }
        else cout<<"Scalene";
    }
    else cout<<"Not a triangle"<<endl;
}