#include<iostream>
using namespace std;
int main()
{
    float a,b,c,d=0;
    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;
else
{
    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;
}
    return 0;
}