#include<bits/stdc++.h>
using namespace std;

int main(){
	int a[4];
	for(int i=1;i<=3;i++)cin>>a[i];
	sort(a,a+3);
	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;
	else if(a[1]*a[1]+a[2]*a[2]>a[3]*a[3])cout<<"Acute triangle"<<endl;
	else if(a[1]*a[1]+a[2]*a[2]<a[3]*a[3])cout<<"Obtuse triangle"<<endl;
	if(a[1]==a[2]||a[1]==a[3]||a[3]==a[2])cout<<"Isosceles triangle"<<endl;
	if(a[1]==a[2]&&a[1]==a[3]&&a[2]==a[3])cout<<"Equilateral triangle"<<endl; 
	return 0;
}

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