char trojkat(int x1, int y1, int x2, int y2, int x3, int y3)
{
    using std::sqrt;
    using std::pow;
    using std::min;
    using std::max;
    double bok12 = sqrt( pow(x2-x1, 2) + pow(y2-y1, 2) );
    double bok23 = sqrt( pow(x3-x2, 2) + pow(y3-y2, 2) );
    double bok13 = sqrt( pow(x3-x1, 2) + pow(y3-y1, 2) );

    double a = min({bok12, bok23, bok13});
    double b = max({
        min(bok12, bok23),
        min(bok12, bok13),
        min(bok23, bok13) });
    double c = max({bok12, bok23, bok13});

    double diff = c*c - (a*a + b*b);

    if (diff < 0.000001) {
        return 'P';
    } else if (diff > 0) {
        return 'R';
    } else {
        return 'O';
    }
}