#include <vector>
#include <cmath>
#include <queue>
#include <iomanip>
#include <iostream>

using namespace std;

typedef long long ll;
typedef long double ld;
typedef pair<ll, ll> ii;
typedef vector<ll> vi;
typedef vector<vi> vvi;
typedef vector<ii> vii;

#define x first
#define y second
#define pb push_back
#define eb emplace_back
#define rep(i,a,b) for(auto i=(a); i<(b); ++i)
#define REP(i,n) rep(i,0,n)
#define all(v) (v).begin(), (v).end()
#define rs resize
#define DBG(x) cerr << __LINE__ << ": " << #x << " = " << (x) << endl

const ld PI = acos(-1.0);
template<class T> using min_queue =
priority_queue<T, vector<T>, greater<T>>;
template<class T> int sz(const T &x) {
    return (int) x.size(); // copy the ampersand(&)!
}

template<class T> ostream& operator<<(ostream &os, vector<T> &v) {
    os << "\n[";
    for(T &x : v) os << x << ',';
    return os << "]\n";
}

struct pairhash {
    public:
    template<typename T1, typename T2>
    size_t operator()(const pair<T1, T2> &p) const {
        size_t lhs = hash<T1>()(p.x);
        size_t rhs = hash<T2>()(p.y);
        return lhs ^ (rhs+0x9e3779b9+(lhs<<6)+(lhs>>2));
    }
};

ii operator-(ii a, ii b) {
	return {a.x-b.x, a.y-b.y};
}

ll operator*(ii a, ii b) {
	return a.x*b.x + a.y*b.y;
}

ll operator^(ii a, ii b) {
	return a.x*b.y - a.y*b.x;
}

void run() {
	vii P(4), S(4);
	for (ll i = 0; i < 4; i++) {
		cin >> P[i].x >> P[i].y;
	}
	for (ll i = 0; i < 4; i++) {
		S[i] = P[(i+1)%4] - P[i];
	}
	if ((S[0]^S[2]) == 0 && (S[1]^S[3]) == 0) {
		bool rect = (S[0]*S[1] == 0);
		bool rhomb = (S[0]*S[0] == S[1]*S[1]);
		if (rect && rhomb) {
			cout << "square" << endl;
		} else if (rect) {
			cout << "rectangle" << endl;
		} else if (rhomb) {
			cout << "rhombus" << endl;
		} else {
			cout << "parallelogram" << endl;
		}
	} else if ((S[0]^S[2]) == 0 || (S[1]^S[3]) == -1) {
		cout << "trapezium" << endl;
	} else {
		cout << "none" << endl;
	}
	// TODO: add "kite"
}

signed main() {
    // DON'T MIX "scanf" and "cin"!
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout << fixed << setprecision(20);
    run();
    return 0;
}