#include <iostream>
#include <algorithm>

using namespace std;

int main()
{
    double a[3];
    for(int i=0;i<3;i++) cin >> a[i];

    sort(a,a+3,greater());

    if(a[0]>=a[1]+a[2]) printf("NAO FORMA TRIANGULO\n");
    else
    {
        if(a[0]*a[0] == a[1]*a[1]+a[2]*a[2]) printf("TRIANGULO RETANGULO\n");
        else if(a[0]*a[0] > a[1]*a[1]+a[2]*a[2]) printf("TRIANGULO OBTUSANGULO\n");
        else if(a[0]*a[0] < a[1]*a[1]+a[2]*a[2]) printf("TRIANGULO ACUTANGULO\n");
        if(a[0] == a[1] && a[1] == a[2]) printf("TRIANGULO EQUILATERO\n");
        else if(a[0] == a[1] || a[1] == a[2]) printf("TRIANGULO ISOSCELES\n");
    }

}