#include <iostream>
using namespace std;
int main(int argc, char** argv) {
    long long int a, b, c;
    while(cin>>a>>b>>c){
    a*=a;b*=b;c*=c;
    if(a+b==c||a+c==b||b+c==a)    cout<<"right triangle"<<endl;
    else if(c>a+b||b>a+c||a>b+c)  cout<<"obtuse triangle"<<endl;
    else  cout<<"acute triangle"<<endl;}
    return 0;
}