#include<iostream>

using namespace std;

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

    //将a,b,c降序排序
    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 = c;
        c = b;
        b = 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 || a == c || b == c ) cout << "TRIANGULO ISOSCELES" << endl;

    }
    return 0;
}