#include<iostream>
#include<algorithm>
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";
    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 || c == a) cout << "TRIANGULO ISOSCELES" << endl;

    }
    return 0;
}