#include<bits/stdc++.h>
using namespace std;
double a,b,c;
int main()
{
    cin>>a>>b>>c;
    if(a<b)swap(a,b);
    if(a<c)swap(a,c);
    if(b<c)swap(b,c);
    if(a>=b+c){
        cout<<"NAO FORMA TRIANGULO"<<endl;
        return 0;
    }
    if(a*a==b*b+c*c)cout<<"TRIANGULO RETANGULO"<<endl;
    if(a*a>b*b+c*c)cout<<"TRIANGULO OBTUSANGULO"<<endl;
    if(a*a<b*b+c*c)cout<<"TRIANGULO ACUTANGULO"<<endl;
    if(a*a==b*b&&b*b==c*c)cout<<"TRIANGULO EQUILATERO"<<endl;
    if(a==b&&b!=c||b==c&&a!=b)cout<<"TRIANGULO ISOSCELES"<<endl;
}