#include<bits/stdc++.h>
using namespace std;
long long a[5];
int main(){
	cin>>a[1]>>a[2]>>a[3];
	sort(a+1,a+4);
	if(a[1]+a[2]<a[3]){
		cout<<"Not triangle";
		return 0;
	}
	if(a[1]*a[1]+a[2]*a[2]==a[3]*a[3]) cout<<"Right triangle"<<endl;
	if(a[1]*a[1]+a[2]*a[2]>a[3]*a[3]) cout<<"Acute triangle"<<endl;
	if(a[1]*a[1]+a[2]*a[2]<a[3]*a[3]) cout<<"Obtuse triangle"<<endl;
	if(a[1]==a[2]||a[2]==a[3]||a[1]==a[3]) cout<<"Isosceles triangle"<<endl;
	if(a[1]==a[2]&&a[2]==a[3]) cout<<"Equilateral triangle";
	return 0;
}

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