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.awt.Point;
 
public class Main {
	static final long MOD = 998244353L;
	//static final long INF = -1000000000000000007L;
	//static final long MOD = 1000000007L;
	//static final int INF = 1000000007;
	
	public static void main(String[] args) {
		FastScanner sc = new FastScanner();
		PrintWriter pw = new PrintWriter(System.out);
		Point a = new Point(sc.ni(),sc.ni());
		Point b = new Point(sc.ni(),sc.ni());
		int segs = sc.ni();
		int N = 0;
		HashMap<Point,Integer> hm = new HashMap<Point,Integer>();
		ArrayList<Point> points = new ArrayList<Point>();
		for (int i = 0; i < segs; i++) {
			int row = sc.ni();
			int col1 = sc.ni();
			int col2 = sc.ni();
			for (int j = col1; j <= col2; j++) {
				Point p = new Point(row,j);
				hm.put(p, N);
				points.add(p);
				N++;
			}
		}
		//N holds the number of points
		ArrayList<Integer>[] adj = new ArrayList[N];
		for (int i = 0; i < N; i++) {
			adj[i] = new ArrayList<Integer>();
		}
		for (int i = 0; i < N; i++) {
			Point p = points.get(i);
			for (int x = -1; x <= 1; x++) {
				for (int y = -1; y <= 1; y++) {
					Point q = new Point(p.x+x,p.y+y);
					if (hm.containsKey(q) && !(x==0&&y==0)) {
						adj[i].add(hm.get(q));
					}
				}
			}
		}

		int rootID = hm.get(a);
		int destID = hm.get(b);
		
		int[] dist = new int[N];
		Arrays.fill(dist,Integer.MAX_VALUE);
		dist[rootID] = 0;
		
		ArrayDeque<Integer> bfs = new ArrayDeque<Integer>();
		bfs.add(rootID);
		while (!bfs.isEmpty()) {
			int node = bfs.pollFirst();
			if (node == destID) {
				break;
			}
			for (int neighbor: adj[node]) {
				if (dist[neighbor]==Integer.MAX_VALUE) {
					dist[neighbor] = dist[node]+1;
					bfs.add(neighbor);
				}
			}
		}
		if (dist[destID]==Integer.MAX_VALUE) {
			pw.println(-1);
		} else {
			pw.println(dist[destID]);
		}
		pw.close();
 	}
	
    public static int[][] sort(int[][] array) {
    	//Sort an array (immune to quicksort TLE)
		Random rgen = new Random();
		for (int i = 0; i < array.length; i++) {
		    int randomPosition = rgen.nextInt(array.length);
		    int[] temp = array[i];
		    array[i] = array[randomPosition];
		    array[randomPosition] = temp;
		}
		Arrays.sort(array, new Comparator<int[]>() {
			  @Override
        	  public int compare(int[] arr1, int[] arr2) {
				  return arr1[0]-arr2[0]; //ascending order
	          }
		});
		return array;
	}
    
    public static long[][] sort(long[][] array) {
    	//Sort an array (immune to quicksort TLE)
		Random rgen = new Random();
		for (int i = 0; i < array.length; i++) {
		    int randomPosition = rgen.nextInt(array.length);
		    long[] temp = array[i];
		    array[i] = array[randomPosition];
		    array[randomPosition] = temp;
		}
		Arrays.sort(array, new Comparator<long[]>() {
			  @Override
        	  public int compare(long[] arr1, long[] arr2) {
				  return 0;
	          }
		});
		return array;
	}
    
    static class FastScanner { 
        BufferedReader br; 
        StringTokenizer st; 
  
        public FastScanner() { 
            br = new BufferedReader(new InputStreamReader(System.in)); 
        } 
  
        String next() { 
            while (st == null || !st.hasMoreElements()) { 
                try { 
                    st = new StringTokenizer(br.readLine());
                } catch (IOException  e) { 
                    e.printStackTrace(); 
                } 
            } 
            return st.nextToken(); 
        } 
  
        int ni() { 
            return Integer.parseInt(next()); 
        } 
  
        long nl() { 
            return Long.parseLong(next()); 
        } 
  
        double nd() { 
            return Double.parseDouble(next()); 
        } 
  
        String nextLine() { 
            String str = ""; 
            try { 
                str = br.readLine(); 
            } catch (IOException e) {
                e.printStackTrace(); 
            } 
            return str;
        }
    }
}