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.FileNotFoundException;
import java.io.OutputStreamWriter;
import java.io.BufferedWriter;
import java.util.PriorityQueue;
import java.io.BufferedReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.File;
import java.io.Writer;
import java.util.Collection;
import java.util.HashSet;
import java.io.InputStreamReader;
import java.io.IOException;
import java.io.FileReader;
import java.util.Arrays;
import java.util.StringTokenizer;
import java.util.Queue;
import java.io.InputStream;

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

class TaskC {

    class Pair implements Comparable<Pair>{

        long x;
        long y;
        long d;
        public Pair(long x, long y, long d){
            this.x = x;
            this.y = y;
            this.d = d;
        }
        public int compareTo(Pair o) {
            return Long.compare(d,o.d);
        }
    }


    public void solve(int testNumber, FastScanner s, Output ww) {
        try{
            long x0 = s.nextLong();
            long y0 = s.nextLong();
            long x1 = s.nextLong();
            long y1 = s.nextLong();

            HashSet<Long> st = new HashSet<Long>();
            int n = s.nextInt();
            while(n-->0){
                long r = s.nextLong();
                long a = s.nextLong();
                long b = s.nextLong();
                for(long i=a;i<=b;i++) st.add((r<<32)+i);
            }


            Queue<Pair> p = new PriorityQueue<Pair>();
            p.add(new Pair(x0,y0,0));
            st.remove((x0<<32)+y0);

            while(!p.isEmpty()){
                Pair pair = p.poll();
                if(pair.x == x1 && pair.y == y1){
                    ww.printLine(pair.d);
                    return;
                }
                for(int dx= -1;dx <= 1;dx++){
                    for(int dy = -1;dy <= 1;dy++){
                        long x = pair.x+dx;
                        long y = pair.y+dy;
                        if(st.contains((x<<32)+y)){
                            st.remove((x<<32)+y);
                            p.add(new Pair(x,y,(pair.d+1)));
                        }
                    }
                }
            }
            ww.printLine(-1);


        }catch(Exception e){
            e.printStackTrace();
        }
    }
}

class FastScanner {
    BufferedReader s;
    StringTokenizer st;

    public FastScanner(InputStream InputStream){
        st = new StringTokenizer("");
        s = new BufferedReader(new InputStreamReader(InputStream));
    }

    public FastScanner(File f) throws FileNotFoundException{
        st = new StringTokenizer("");
        s = new BufferedReader (new FileReader(f));
    }

    public int nextInt() throws IOException{
        if(st.hasMoreTokens())
            return Integer.parseInt(st.nextToken());
        else{
            st = new StringTokenizer(s.readLine());
            return nextInt();
        }
    }

    public long nextLong() throws IOException{
        if(st.hasMoreTokens())
            return Long.parseLong(st.nextToken());
        else{
            st = new StringTokenizer(s.readLine());
            return nextLong();
        }
    }

}

class Output {

    private final PrintWriter writer;

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

    public Output(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 printLine(Object...objects) {
        print(objects);
        writer.println();
    }

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


}
