#include<iostream> using namespace std; int main() { int a,b,c; cin>>a>>b>>c; if(a+b<=c||a+c<=b||b+c<=a){ cout<<"illegal triangle"; }else{ if(b>c&&b>a){ int temp=a; a=b; b=temp; }else if(c>b&&c>a){ int temp=a; a=c; c=temp; } if(b*b+c*c==a*a){ cout<<"right triangle"; }else if(b*b+c*c<a*a){ cout<<"obtuse triangle"; }else{ cout<<"acute triangle"; } } return 0; }