#include <iostream> using namespace std; int main(){ int a,b,c,d; cin>>a; cin>>b; cin>>c; if(a<b){ d=a; a=b; b=d; } if(a<c){ d=a; a=c; c=d; } if(b+c>a){ if(bb+cc>aa){ cout<<"acute triangle"; } if(bb+cc==aa){ cout<<"right triangle"; } if(bb+cc<a*a){ cout<<"obtuse triangle"; } } else{ cout<<"illegal triangle"; } }