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.io.InputStreamReader;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.BufferedWriter;
import java.util.HashMap;
import java.awt.Point;
import java.io.BufferedReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.Writer;
import java.util.AbstractCollection;
import java.util.StringTokenizer;
import java.util.LinkedList;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 * @author Duy Hung
 */
public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		OutputWriter out = new OutputWriter(outputStream);
		TaskC solver = new TaskC();
		solver.solve(1, in, out);
		out.close();
	}
}

class TaskC {
    int []dx = {-1, -1, -1, 0, 1, 1, 1, 0};
    int []dy = {-1, 0, 1, 1, 1, 0, -1, -1};

	public void solve(int testNumber, InputReader in, OutputWriter out) {
        HashMap <Point, Integer> map = new HashMap<Point, Integer>();
        int sx = in.nextInt(), sy = in.nextInt(), tx = in.nextInt(), ty = in.nextInt();
        map.put(new Point(sx, sy), 0);
        map.put(new Point(tx, ty), 0);

        if (sx == tx && sy == ty) {
            out.printLn(0);
            return;
        }

        int n = in.nextInt();
        while (n-- > 0) {
            int r = in.nextInt(), a = in.nextInt(), b = in.nextInt();
            for (int i = a; i <= b; ++i) map.put(new Point(r, i), 0);
        }

        LinkedList <Point> queue = new LinkedList<Point>();
        queue.add(new Point(sx, sy));
        map.put(new Point(sx, sy), 1);

        while (!queue.isEmpty()) {
            Point cur = queue.removeFirst();
            //out.printLn("CUR", cur.x, cur.y, map.get(cur));
            for (int i = 0; i < dx.length; ++i) {
                Point next = new Point(cur.x + dx[i], cur.y + dy[i]);
                if (map.containsKey(next) == false || map.get(next) > 0) continue;
                map.put(next, map.get(cur) + 1);
                //out.printLn(next.x, next.y, map.get(next));
                queue.add(next);
                if (next.equals(new Point(tx, ty))) {
                    out.printLn(map.get(cur));
                    return;
                }
            }
        }

        out.printLn(-1);
	}
}

class InputReader {
    private BufferedReader reader;
    private StringTokenizer tokenizer;

    public InputReader(InputStream stream) {
        reader = new BufferedReader(new InputStreamReader(stream));
        tokenizer = null;
    }

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

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

    }

class OutputWriter {
    private final PrintWriter writer;

    public OutputWriter(OutputStream outputStream) {
        writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
    }

    public OutputWriter(Writer writer) {
        this.writer = new PrintWriter(writer);
    }

    public void print(Object...objects) {
        for (int i = 0; i < objects.length; i++) {
            if (i != 0)
                writer.print(' ');
            writer.print(objects[i]);
        }
    }

    public void printLn(Object...objects) {
        print(objects);
        writer.println();
    }

    public void close() {
        writer.close();
    }
}

