#include <bits/stdc++.h>
using namespace std;
int main()
{
    
    int a,b,c,a1,b1,c1;
    cin >>a>>b>>c;
    a1 = min(min(a,b),min(b,c));//排序
    c1 = max(max(a,b),max(b,c));
    b1 = (a + b + c) - ( a1 + c1);
    if (a1 + b1 <= c1) cout <<"Not triangle"<<endl;
    else
    {
    	if (pow(a1,2) + pow(b1,2) == pow(c1,2)) cout <<"Right triangle"<<endl;
		if (pow(a1,2) + pow(b1,2) >= pow(c1,2)) cout <<"Acute triangle"<<endl;
		if (pow(a1,2) + pow(b1,2) < pow(c1,2)) cout <<"Obtuse triangle"<<endl;
		if (a1 == b1 || b1 == c1 || a1 == c1)
		{
			if ((a1 == b1) || (b1 == c1) || (b1 == c1)) cout <<"Isosceles triangle"<<endl;
			if (a1 == b1 && b1 == c1) cout <<"Equilateral triangle"<<endl;
		}
	}
    return 0;//不欢乐结束
}