#include <iostream>

using namespace std;

int main()
{
    double A, B, C;
    cin >> A >> B >> C;

    if (B > A)
    {
        double t;
        t = A;
        A = B;
        B = t;
    }
    if (C > A)
    {
        double t;
        t = A;
        A = C;
        C = t;
    }
    if (C > B)
    {
        double t;
        t = B;
        B = C;
        C = t;
    }

    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) cout << "TRIANGULO EQUILATERO" << endl;
        else if (A == B || B == C || A == C) cout << "TRIANGULO ISOSCELES" << endl;
    }


    return 0;

}