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

int main(){
/*
freopen (".in","r",stdin);
freopen (".out","w",stdout);
*/
int a[4]={};
for(int i=1;i<=3;i++){
	cin>>a[i];
}
sort(a+1,a+4);
if(a[1]+a[2]<=a[3]) cout<<"Not triangle"<<endl;
if(pow(a[1],2)+pow(a[2],2)==pow(a[3],2)){
	cout<<"Right triangle"<<endl;
}
if(pow(a[1],2)+pow(a[2],2)>pow(a[3],2)){
	cout<<"Acute triangle"<<endl;
}
if(pow(a[1],2)+pow(a[2],2)<pow(a[3],2)){
	cout<<"Obtuse triangle"<<endl;
}
if(a[1]==a[2]||a[1]==a[3]||a[2]==a[3]){
	cout<<"Isosceles triangle"<<endl;
}
if(a[1]==a[2]&&a[1]==a[3]){
	cout<<"Equilateral triangle"<<endl;
}


/*
fclose(stdin);
fclose(stdout);
*/
	return 0;
}