#include<cstdio>
#include<iostream>
using namespace std;
int main()
{
    double a,b,c;
    cin>>a>>b>>c;
    double x,y,z;
    x=max(a,max(b,c));
    y=min(a,min(b,c));
    z=(a+b+c)-(x+y);
    //printf("%lf %lf %lf\n",x,y,z);
    if(x>=y+z)
    {
        printf("NAO FORMA TRIANGULO\n");
        return 0;
    }
    if(x*x==y*y+z*z)
        printf("TRIANGULO RETANGULO\n");
    if(x*x>y*y+z*z)
        printf("TRIANGULO OBTUSANGULO\n");
    if(x*x<y*y+z*z)
        printf("TRIANGULO ACUTANGULO\n");
    if(x==y&&y==z)
        printf("TRIANGULO EQUILATERO\n");
    if(x==y&&x!=z||x==z&&z!=y||z==y&&z!=x)
        printf("TRIANGULO ISOSCELES\n");
    return 0;
}