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import java.awt.Point;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Scanner;

public class ple {

	public static void main(String[] args) throws FileNotFoundException {

		Scanner odczyt = new Scanner(new BufferedInputStream(System.in));
		int iloscPlemion = odczyt.nextInt();
		ArrayList<Plemie> listaPlemion = new ArrayList<Plemie>();
		for (int idPlemienia = 0; idPlemienia < iloscPlemion; idPlemienia++) {
			int x1 = odczyt.nextInt();
			int x2 = odczyt.nextInt();
			int y1 = odczyt.nextInt();
			int y2 = odczyt.nextInt();
			Plemie plemie = new Plemie(x1, y1, x2, y2);
			boolean czyDodano = false;
			for (int i = listaPlemion.size()-1; i>=0; i--){
				if (listaPlemion.get(i).czyNachodziInnePlemie(plemie)){
					Plemie zawierajace = listaPlemion.get(i).zawierajaceOba(plemie);
					listaPlemion.set(i,zawierajace);
					czyDodano = true;
					break;
				}
			}
			if (!czyDodano)
				listaPlemion.add(plemie);
		}
		odczyt.close();
		for (int i = listaPlemion.size()-1; i>=0 ; i--){
			for (int j = i-1; j>=0; j--){
				if (listaPlemion.get(i).czyNachodziInnePlemie(listaPlemion.get(j))){
					listaPlemion.set(j, listaPlemion.get(i).zawierajaceOba(listaPlemion.get(j)));
					listaPlemion.remove(i);
					i = listaPlemion.size();
					break;
				}
			}
		}
		Collections.sort(listaPlemion, new Leksykograficzna());
		PrintWriter r = new PrintWriter(new BufferedOutputStream(System.out));
		r.println(listaPlemion.size());
		for (int i = 0; i<listaPlemion.size(); i++){
			r.println(listaPlemion.get(i).toString());
		}
		r.flush();
	}
}

class Leksykograficzna implements Comparator<Plemie> {
	@Override
	public int compare(Plemie p, Plemie d) {
		return p.toString().compareTo(d.toString());

	}
}

class Plemie {
	Point ld = null;
	Point pg = null;

	Plemie(int x1, int y1, int x2, int y2) {
		this.ld = new Point(x1, y1);
		this.pg = new Point(x2, y2);
	}

	boolean czyNachodziInnePlemie(Plemie inne) {
		return (this.ld.x < inne.pg.x &&
				this.pg.x > inne.ld.x &&
				this.ld.y < inne.pg.y &&
				this.pg.y > inne.ld.y);
	}
	
	Plemie zawierajaceOba(Plemie inne){
		return new Plemie(Math.min(ld.x, inne.ld.x),
						 Math.min(ld.y, inne.ld.y),
						 Math.max(pg.x, inne.pg.x),
						 Math.max(pg.y, inne.pg.y));
	}
	
	public String toString(){
		return ld.x + " " + pg.x + " " + ld.y + " " + pg.y;
	}
}