#include<iostream>
using namespace std;
int main(){
    double a,b,c,tmp;
    scanf("%lf %lf %lf",&a,&b,&c);
    if(a<b){
        tmp=a;
        a=b;
        b=tmp;
    }

    if(a<c){
        tmp=a;
        a=c;
        c=tmp;
    }
    if(b<c){
        tmp=b;
        b=c;
        c=tmp;
    }
    if(a>=b+c) cout<<"NAO FORMA TRIANGULO";
        else {
            if(a*a==b*b+c*c) cout<<"TRIANGULO RETANGULO\n";
             if(a*a>b*b+c*c) cout<<"TRIANGULO OBTUSANGULO\n";
             if(a*a<b*b+c*c) cout<<"TRIANGULO ACUTANGULO\n";
             if((a==b&& c!=a)||(b==c && a!=c)) cout<<"TRIANGULO ISOSCELES\n";
             if(a==b && a==c) cout<<"TRIANGULO EQUILATERO";
        }
    return 0;
}