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

问题出在哪里QAQ