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.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.BufferedWriter;
import java.util.Collection;
import java.util.HashMap;
import java.util.InputMismatchException;
import java.io.IOException;
import java.io.FileInputStream;
import java.util.ArrayList;
import java.util.Objects;
import java.io.Writer;
import java.io.OutputStreamWriter;
import java.util.Queue;
import java.util.LinkedList;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
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);
        CKingsPath solver = new CKingsPath();
        solver.solve(1, in, out);
        out.close();
    }

    static class CKingsPath {
        private HashMap<Util.Pair<Integer>, Integer> hm = new HashMap<>();
        private int x0;
        private int y0;
        private int x1;
        private int y1;
        private int n;
        private Util.Pair<Integer> start;
        private Util.Pair<Integer> end;
        private int[] row = new int[]{-1, -1, -1, 0, 0, 1, 1, 1};
        private int[] col = new int[]{-1, 0, 1, -1, 1, -1, 0, 1};

        private void bfs() {
            hm.put(start, 0);
            Queue<Util.Pair<Integer>> queue = new LinkedList<>();
            queue.offer(start);
            while (!queue.isEmpty()) {
                Util.Pair<Integer> pair = queue.poll();
                for (int i = 0; i < 8; i++) {
                    Util.Pair<Integer> to = new Util.Pair<>(row[i] + pair.x, col[i] + pair.y);
                    if (hm.containsKey(to) && hm.get(to) == -1) {
                        hm.put(to, hm.get(pair) + 1);
                        queue.offer(to);
                    }
                }
            }
        }

        public void solve(int testNumber, InputReader in, OutputWriter out) {
            x0 = in.nextInt();
            y0 = in.nextInt();
            x1 = in.nextInt();
            y1 = in.nextInt();
            n = in.nextInt();
            start = new Util.Pair<>(x0, y0);
            end = new Util.Pair<>(x1, y1);
            for (int seg = 1; seg <= n; seg++) {
                int r = in.nextInt(), s = in.nextInt(), e = in.nextInt();
                for (int i = s; i <= e; i++) {
                    Util.Pair<Integer> cell = new Util.Pair<>(r, i);
                    if (!hm.containsKey(cell)) hm.put(cell, -1);
                }
            }
            bfs();
            out.println(hm.get(end));
            out.flush();
        }

    }

    static class Util {
        public static class Pair<T> {
            public T x;
            public T y;

            public Pair(T x, T y) {
                this.x = x;
                this.y = y;
            }

            public boolean equals(Object obj) {
                if (obj == this) return true;
                if (!(obj instanceof Util.Pair)) return false;
                Util.Pair<T> pair = (Util.Pair<T>) obj;
                return this.x == pair.x && this.y == pair.y;
            }

            public String toString() {
                return ("(" + this.x + "," + this.y + ")");
            }

            public int hashCode() {
                return Objects.hash(x, y);
            }

        }

    }

    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[8192];
        private int curChar;
        private int numChars;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        public InputReader(FileInputStream file) {
            this.stream = file;
        }

        public int read() {
            if (numChars == -1) {
                throw new InputMismatchException();
            }
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0) {
                    return -1;
                }
            }
            return buf[curChar++];
        }

        public int nextInt() {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9') {
                    throw new InputMismatchException();
                }
                res = (res << 3) + (res << 1) + c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        private boolean isSpaceChar(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

    }

    static class OutputWriter {
        private final PrintWriter writer;
        private ArrayList<String> res = new ArrayList<>();
        private StringBuilder sb = new StringBuilder("");

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

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

        public void println(Object... objects) {
            for (int i = 0; i < objects.length; i++) {
                sb.append(objects[i]);
            }
            res.add(sb.toString());
            sb = new StringBuilder("");
        }

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

        public void flush() {
            for (String str : res) writer.printf("%s\n", str);
            res.clear();
            sb = new StringBuilder("");
        }

    }
}

