#include <stdio.h>
int main()
{
    double a, b, c, temp;
    scanf("%lf %lf %lf", &a, &b, &c);
    if (a < b)
    {
        temp = a;
        a = b;
        b = temp;
    }
    if (b < c)
    {
        temp = b;
        b = c;
        c = temp;
    }
    if (a < b)
    {
        temp = a;
        a = b;
        b = temp;
    }
    if (a >= b + c)
    {
        printf("NAO FORMA TRIANGULO\n");
    }
    else if (a * a == b * b + c * c)
    {
        printf("TRIANGULO RETANGULO\n");
    }
    else if (a * a > b * b + c * c)
    {
        printf("TRIANGULO OBTUSANGULO\n");
    }
    else if (a * a < b * b + c * c)
    {
        printf("TRIANGULO ACUTANGULO\n");
    }
    if (a == b && b == c)
    {
        printf("TRIANGULO EQUILATERO\n");
    }
    else if (a == b || b == c)
    {
        printf("TRIANGULO ISOSCELES\n");
    }
    return 0;

}