#include <bits/stdc++.h>
using namespace std;
int main(){
    int a,b,c,t;
    cin>>a>>b>>c;
    if(a<b) {
        t=a;
        a=b;
        b=t;
    }
    if(a<c) {
        t=a;
        a=c;
        c=t;
    }
    if(b<c) {
        t=b;
        b=c;
        c=t;
    }
    if(b+c<=a||a<=0){
        cout<<"Not triangle";
        return 0;
    }
    if(b*b+c*c==a*a) cout<<"Right triangle\n";
    if(b*b+c*c>a*a) cout<<"Acute triangle\n";
    if(b*b+c*c<a*a) cout<<"obtuse triangle\n";
    if(a==b||b==c||c==a) cout<<"Isosceles triangle\n";
    if(a==b&&a==c) cout<<"Equilateral triangle";
    return 0;
}//425