#include <iostream>
using namespace std;

int main()
{
   int x,y,z;
   while(cin>>x>>y>>z)
   {
        if((x*x+y*y==z*z)||(x*x+z*z==y*y)||(y*y+z*z==x*x))
        cout<<"right triangle"<<endl;
        else if((x*x+y*y>z*z)&&(x*x+z*z>y*y)&&(y*y+z*z>x*x))
        cout<<"acute triangle"<<endl;
        else
        cout<<"obtuse triangle"<<endl;
    } 
   return 0;
}

 建議你先排序三邊大小

 因為你都是錯在把  acute triangle 判斷成 obtuse triangle