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import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.PriorityQueue;
import java.util.StringTokenizer;


public class ple {

	public static class Tribe {
		
		private int x0;
		private int x1;
		private int y0;
		private int y1;
		private int xy0;
		private int xy1;
		
		public Tribe(int x0, int x1, int y0, int y1) {
			this.x0 = x0;
			this.x1 = x1;
			this.y0 = y0;
			this.y1 = y1;
			this.xy0 = this.x0 + this.y0;
			this.xy1 = this.x1 + this.y1;
		}

		public int getX0() {
			return x0;
		}

		public int getX1() {
			return x1;
		}

		public int getY0() {
			return y0;
		}

		public int getY1() {
			return y1;
		}

		public int getXy0() {
			return xy0;
		}

		public int getXy1() {
			return xy1;
		}

		@Override
		public String toString() {
			return x0 + " " + x1 + " " + y0 + " " + y1;
		}
		
	}
	
	public static class TribeX0Comparator implements Comparator<Tribe> {
		@Override
		public int compare(Tribe arg0, Tribe arg1) {
			return Integer.compare(arg0.getX0(), arg1.getX0());
		}
	}
	
	public static class TribeX1Comparator implements Comparator<Tribe> {
		@Override
		public int compare(Tribe arg0, Tribe arg1) {
			return Integer.compare(arg0.getX1(), arg1.getX1());
		}
	}
	
	public static class TribeY0Comparator implements Comparator<Tribe> {
		@Override
		public int compare(Tribe arg0, Tribe arg1) {
			return Integer.compare(arg0.getY0(), arg1.getY0());
		}
	}
	
	public static class TribeY1Comparator implements Comparator<Tribe> {
		@Override
		public int compare(Tribe arg0, Tribe arg1) {
			return Integer.compare(arg0.getY1(), arg1.getY1());
		}
	}
	
	public static class TribeXy0Comparator implements Comparator<Tribe> {
		@Override
		public int compare(Tribe arg0, Tribe arg1) {
			return Integer.compare(arg0.getXy0(), arg1.getXy0());
		}
		
	}
	
	public static class TribeXy1Comparator implements Comparator<Tribe> {
		@Override
		public int compare(Tribe arg0, Tribe arg1) {
			return Integer.compare(arg0.getXy1(), arg1.getXy1());
		}
	}
	
	public static void main(String[] args) {
		try{
			BufferedReader buffReader = new BufferedReader(new InputStreamReader(System.in));
			int n = Integer.parseInt(buffReader.readLine());
			
			PriorityQueue<Tribe> pingQueue = new PriorityQueue<Tribe>(n, new TribeXy0Comparator());
			PriorityQueue<Tribe> pongQueue = new PriorityQueue<Tribe>(n, new TribeXy0Comparator());
			LinkedList<Tribe> testList = new LinkedList<Tribe>();
			
			for(int i=0; i<n; i++){
				StringTokenizer tokenizer = new StringTokenizer(buffReader.readLine());
				pingQueue.add(new Tribe(Integer.parseInt(tokenizer.nextToken()), Integer.parseInt(tokenizer.nextToken()),
						Integer.parseInt(tokenizer.nextToken()), Integer.parseInt(tokenizer.nextToken())));
			}
			
			int pingQueueSize = pingQueue.size();
			int pongQueueSize = pongQueue.size();
			while(pingQueueSize != pongQueueSize){
			testList.add(pingQueue.poll());
			while(!pingQueue.isEmpty()){
				Tribe first = pingQueue.poll();
				Iterator<Tribe> testTribeIter = testList.iterator();
				boolean addTest = true;
				while(testTribeIter.hasNext() && addTest){
					Tribe testTribe = testTribeIter.next();
					if(testTribe.getXy1() < first.getXy0()){
						pongQueue.add(testTribe);
						testTribeIter.remove(); 
					}else{
						if(first.getX0() < testTribe.getX1() && first.getY0() < testTribe.getY1() && first.getX1() > testTribe.getX0() && first.getY1() > testTribe.getY0()){
							pingQueue.add(new Tribe(Math.min(first.getX0(), testTribe.getX0()),  Math.max(first.getX1(), testTribe.getX1()), Math.min(first.getY0(), testTribe.getY0()),  Math.max(first.getY1(), testTribe.getY1()) ));
							testTribeIter.remove();
							addTest = false;
						}
					}
				}
				if(addTest)
					testList.add(first);
			}
			Iterator<Tribe> testTribeIter = testList.iterator();
			while(testTribeIter.hasNext()){
				pongQueue.add(testTribeIter.next());
				testTribeIter.remove();
			}
			pingQueue = pongQueue;
			
			pongQueueSize = pingQueueSize;
			pingQueueSize = pingQueue.size();
			
			pongQueue = new PriorityQueue<Tribe>(n, new TribeXy0Comparator());
			}
			
			Tribe[] tribeMap = pingQueue.toArray(new Tribe[0]);
			Arrays.sort(tribeMap, new TribeY1Comparator());
			Arrays.sort(tribeMap, new TribeY0Comparator());
			Arrays.sort(tribeMap, new TribeX1Comparator());
			Arrays.sort(tribeMap, new TribeX0Comparator());
			
			System.out.println(tribeMap.length);
			for(Tribe tribe : tribeMap)
				System.out.println(tribe);
			
		}catch(Exception e){
			e.printStackTrace();
		}

	}

}