#include <iostream>
#include <cstdio>

using namespace std;

int main()
{
    double a, b, c;
    cin >> a >> b >> c;

    //排序
    if(b > a)
    {
        double t = b;
        b = a;
        a = t;
    }
    if (c > a)
    {
        double t = c;
        c = a;
        a = t;
    }
    if (c > b)
    {
        double t = b;
        b = c;
        c = t;
    }

    //逻辑的判断
    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 || a == c || c == b)
        cout << "TRIANGULO ISOSCELES" << endl;


    return 0;
}