#include<iostream>
#include<algorithm>
using namespace std;

int main()
{
    double a,b,c;
    double d[3]={0};
    for(int i=0;i<3;i++)  cin>>d[i];
    sort(d,d+3);
    a = d[2];
    b = d[1];
    c = d[0];

    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==b && b==c && a==c)  cout << "TRIANGULO EQUILATERO"<<endl;
        if((a==b && a!=c && b!=c) || (a==c && a!=b && c!=b)||(b==c && b!=a && c!=a))   cout << "TRIANGULO ISOSCELES"<<endl;
    }
    return 0;
}