1 1 1 2
5
1000000000 1 10000
19920401 1188 5566
1000000000 1 10000
1 1 10000
5 100 200
 6 15 7 15
9
6 15 15
7 14 14
6 15 15
9 14 14
7 14 16
6 15 15
6 15 15
7 14 14
8 15 15
 1 1 1000000000 2
5
1000000000 1 10000
19920401 1188 5566
1000000000 1 10000
1 1 10000
5 100 200
 89 29 88 30
16
87 31 31
14 95 95
98 88 89
96 88 88
14 97 97
13 97 98
100 88 88
88 32 32
99 88 89
90 29 29
87 31 31
15 94 96
89 29 29
88 32 32
97 89 89
88 29 30
 30 14 39 19
31
35 7 11
37 11 12
32 13 13
37 5 6
46 13 13
37 14 14
31 13 13
43 13 19
45 15 19
46 13 13
32 17 17
41 14 19
30 14 14
43 13 17
34 16 18
44 11 19
38 13 13
40 12 20
37 16 18
46 16 18
34 10 14
36 9 10
36 15 19
38 15 19
42 13 19
33 14 15
35 15 19
33 17 18
39 12 20
36 5 7
45 12 12
 9 8 7 8
9
10 6 6
10 6 6
7 7 8
9 5 6
8 9 9
9 5 5
9 8 8
8 5 6
9 10 10
 2 1 1 1
2
1 1 2
2 1 2
 13 16 20 10
18
13 16 16
20 10 10
19 10 10
12 15 15
20 10 10
18 11 11
19 10 10
19 10 10
20 10 10
19 10 10
20 10 10
20 10 10
19 10 10
18 11 11
13 16 16
12 15 15
19 10 10
19 10 10

1
 1
 -1
 1
 9
 2
 1
 -1

import java.awt.Point;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.PriorityQueue;
import java.util.Queue;
import java.util.Random;
import java.util.Scanner;
import java.util.StringTokenizer;

public class Contest {
	private static PrintWriter out = new PrintWriter(System.out);
	private static final Random random = new Random();
	private static int n, m, k, tc, x;
	private static int[] a;
	private static final int OO = (int) 1e9, mod = (int) 1e9 + 7;
	private static final int MAX = (int) (1e5 + 10);
	private static HashMap<Double, Boolean> allowed = new HashMap<>(), visited = new HashMap<Double, Boolean>();
	private static long[] dx = { 0, 1, -1, 0, 1, -1, 1, -1 };
	private static long[] dy = { 1, 0, 0, -1, 1, 1, -1, -1 };

	private static class Point {
		double pos, depth;

		Point(double p, double d) {
			this.pos = p;
			this.depth = d;
		}
	}

	private static double toIdx(double x, double y) {
		return (double) (1e9 * x + y);
	}

	private static double BFS(double x0, double y0, double x1, double y1) {
		Queue<Point> qu = new LinkedList<>();
		qu.add(new Point(toIdx(x0, y0), 0));
		visited.put(toIdx(x0, y0), true);
		double dest = toIdx(x1, y1);
		while (!qu.isEmpty()) {
			Point cur = qu.poll();
			if (cur.pos == dest) {
				return cur.depth;
			}
			// cols*i + j
			for (int i = 0; i < 8; i++) {
				double newX = (long) (cur.pos / 1e9) + dx[i], newY = (long) (cur.pos % 1e9) + dy[i];
				if (visited.containsKey(toIdx(newX, newY)) || !allowed.containsKey(toIdx(newX, newY))) 
					continue;
				qu.add(new Point(toIdx(newX, newY), cur.depth + 1));
				visited.put(toIdx(newX, newY), true);
			}
		}

		return -1;
	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		double x0 = sc.nextDouble() - 1, y0 = sc.nextDouble() - 1, x1 = sc.nextDouble() - 1, y1 = sc.nextDouble() - 1;
		n = sc.nextInt();
		while (n-- > 0) {
			long i = sc.nextLong() - 1;
			long c1 = sc.nextLong() - 1, c2 = sc.nextLong() - 1;
			for (long j = c1; j <= c2; j++) {
				if(!allowed.containsKey(toIdx(i, j)))allowed.put(toIdx(i, j), true);
				//System.out.println(Long.MAX_VALUE - toIdx(i, j));
			}
		}
		
		out.println((int)BFS(x0, y0, x1, y1));
		out.flush();
	}
	

	private static void ruffleSort(int[] a) {
		int n = a.length;// shuffle, then sosrt
		for (int i = 0; i < n; i++) {
			int oi = random.nextInt(n), temp = a[oi];
			a[oi] = a[i];
			a[i] = temp;
		}
		java.util.Arrays.sort(a);
	}

	private static class Scanner {
		public BufferedReader reader;
		public StringTokenizer st;

		public Scanner(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream));
			st = null;
		}

		public String next() {
			while (st == null || !st.hasMoreTokens()) {
				try {
					String line = reader.readLine();
					if (line == null)
						return null;
					st = new StringTokenizer(line);
				} catch (Exception e) {
					throw (new RuntimeException());
				}
			}
			return st.nextToken();
		}

		public int nextInt() {
			return Integer.parseInt(next());
		}

		public long nextLong() {
			return Long.parseLong(next());
		}

		public double nextDouble() {
			return Double.parseDouble(next());
		}
	}

}