#include <bits/stdc++.h>

using namespace std;

int main()
{
    double a,b,c;
    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 == b && b == c)   cout<< "TRIANGULO EQUILATERO" << endl;
    if ((a == b && a != c) || (c == b && a != c))
    //经过排序a>=b>=c 所以等腰三角形只能存在a==b 或 b==c的情况。
        cout << "TRIANGULO ISOSCELES" <<endl;
    return 0;
}