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.*;
import java.util.*;
import java.math.*;
import java.text.DecimalFormat;
import java.text.NumberFormat;
 
public class Main {
      
    int mod = 1000000007;

    int x0, y0, x1, y1;
    Set<Pair<Integer, Integer>> s = new HashSet<>();
    public void solve() throws IOException{

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

      x0 = in.nextInt();
      y0 = in.nextInt();
      x1 = in.nextInt();
      y1 = in.nextInt();

      int m = in.nextInt();

      for(int i = 1; i <= m; i++){

         int r = in.nextInt();
         int a = in.nextInt();
         int b = in.nextInt();

         for(int j = a; j <= b; j++){
            s.add(new Pair<Integer, Integer>(r, j));
         }

      }


      Set<Pair<Integer, Integer>> visited = new HashSet<>();
      Queue<Tuple> q = new LinkedList<>();
      q.add(new Tuple(x0, y0, 0));
      
      while(!q.isEmpty()){

         Tuple t = q.poll();

         int x = t.x, y = t.y, d = t.z;
         Pair<Integer, Integer> p = new Pair<Integer, Integer>(x, y);
         if(visited.contains(p)){
            continue;
         }
         if(x == x1 && y  == y1){
            out.println(d);
            return;
         }
         visited.add(p);

         for(int i = 0; i < 8; i++){
            int nx = x + dx[i];
            int ny = y + dy[i];
            if(inBound(nx, ny) && s.contains(new Pair<Integer, Integer>(nx, ny))){
               q.add(new Tuple(nx, ny, d + 1));
            }
         }

      }

      out.println(-1);
      return;
    }

    public boolean inBound(int x, int y){
      return x >= 1 && x <= 1000000000 && y >= 1 && y <= 1000000000;
    }


    FastScanner in;
    PrintWriter out;
    
    static class FastScanner {
 
        BufferedReader br;
        StringTokenizer st;
 
        FastScanner(InputStream in) {
            br = new BufferedReader(new InputStreamReader(in));
            st = null;
        }
 
        String next() throws IOException {
            while (st == null || !st.hasMoreTokens())
                st = new StringTokenizer(br.readLine());
            return st.nextToken();
        }
 
        String nextLine() throws IOException {
            if (st == null || !st.hasMoreTokens())
                return br.readLine();
            StringBuilder result = new StringBuilder(st.nextToken());
            while (st.hasMoreTokens()) {
                result.append(" ");
                result.append(st.nextToken());
            }
            return result.toString();
        }
 
        int nextInt() throws IOException {
            return Integer.parseInt(next());
        }
 
        long nextLong() throws IOException {
            return Long.parseLong(next());
        }
 
        double nextDouble() throws IOException {
            return Double.parseDouble(next());
        }
 
    }
 
    void run() throws IOException {
        in = new FastScanner(System.in);
        out = new PrintWriter(System.out, false);
        solve();
        out.close();
    }
 
    public static void main(String[] args) throws IOException{
        new Main().run();
    }
 
    public void printArr(int[] arr){
        for(int i = 0; i < arr.length; i++){
            out.print(arr[i] + " ");
        }
        out.println();
    }
 
    public long gcd(long a, long b){
        if(a == 0) return b;
        return gcd(b % a, a);
    }

    public boolean isPrime(long num){

        if(num == 0 || num == 1){
            return false;
        }

        for(int i = 2; i * i <= num; i++){
            if(num % i == 0){
                return false;
            }
        }

        return true;
    }

    public class Pair<A, B>{
        public A x; 
        public B y;

        Pair(A x, B y){
            this.x = x;
            this.y = y;
        }

        @Override
        public boolean equals(Object o) {
            if (this == o) return true;
            if (o == null || getClass() != o.getClass()) return false;
            Pair<?, ?> pair = (Pair<?, ?>) o;
            if (!x.equals(pair.x)) return false;
            return y.equals(pair.y);
        }

        @Override
        public int hashCode() {
            int result = x.hashCode();
            result = 31 * result + y.hashCode();
            return result;
        }

    }

    class Tuple{
        int x; int y; int z;
        Tuple(int ix, int iy, int iz){
            x = ix;
            y = iy;
            z = iz;
        }
    }
}
