package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func configure(scanner *bufio.Scanner) {
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 1000005), 1000005)
}
func getNextString(scanner *bufio.Scanner) string {
	scanned := scanner.Scan()
	if !scanned {
		panic("scan failed")
	}
	return scanner.Text()
}
func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}
func getNextInt64(scanner *bufio.Scanner) int64 {
	i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
	return i
}
func getNextFloat64(scanner *bufio.Scanner) float64 {
	i, _ := strconv.ParseFloat(getNextString(scanner), 64)
	return i
}
func main() {
	fp := os.Stdin
	wfp := os.Stdout
	extra := 0
	if os.Getenv("I") == "IronMan" {
		fp, _ = os.Open(os.Getenv("END_GAME"))
		extra = 100
	}
	scanner := bufio.NewScanner(fp)
	configure(scanner)
	writer := bufio.NewWriter(wfp)
	defer func() {
		r := recover()
		if r != nil {
			fmt.Fprintln(writer, r)
		}
		writer.Flush()
	}()
	solve(scanner, writer)
	for i := 0; i < extra; i++ {
		fmt.Fprintln(writer, "-----------------------------------")
		solve(scanner, writer)
	}
}
func solve(scanner *bufio.Scanner, writer *bufio.Writer) {
	h := getNextInt(scanner)
	w := getNextInt(scanner)
	sx := getNextInt(scanner) - 1
	sy := getNextInt(scanner) - 1
	gx := getNextInt(scanner) - 1
	gy := getNextInt(scanner) - 1
	ss := make([]string, h)
	for i := 0; i < h; i++ {
		ss[i] = getNextString(scanner)
	}
	rng := makeGrid(h, w)
	rng[sx][sy] = true
	q := make([]pair, 0)
	q = append(q, pair{sx, sy})
	dy := [4]int{-1, 0, 0, 1}
	dx := [4]int{0, -1, 1, 0}
	for len(q) > 0 {
		p := q[0]
		q = q[1:]
		rng[p[0]][p[1]] = true
		for i := 0; i < 4; i++ {
			xx := p[0] + dx[i]
			yy := p[1] + dy[i]
			if xx < 0 || xx >= h {
				continue
			}
			if yy < 0 || yy >= w {
				continue
			}
			if rng[xx][yy] {
				continue
			}
			if abs(int(ss[xx][yy]-'0')-int(ss[p[0]][p[1]]-'0')) > 1 {
				continue
			}
			rng[xx][yy] = true
			q = append(q, pair{xx, yy})
		}
		for i := 0; i < 4; i++ {
			x := p[0] + dx[i]
			y := p[1] + dy[i]
			xx := p[0] + dx[i]*2
			yy := p[1] + dy[i]*2
			if xx < 0 || xx >= h {
				continue
			}
			if yy < 0 || yy >= w {
				continue
			}
			if rng[xx][yy] {
				continue
			}
			if abs(int(ss[xx][yy]-'0')-int(ss[p[0]][p[1]]-'0')) > 0 {
				continue
			}
			if int(ss[p[0]][p[1]]-'0') <= int(ss[x][y]-'0') {
				continue
			}
			rng[xx][yy] = true
			q = append(q, pair{xx, yy})
		}
	}
	if rng[gx][gy] {
		fmt.Fprintln(writer, "YES")
		return
	}
	fmt.Fprintln(writer, "NO")
}

func abs(a int) int {
	if a < 0 {
		return -a
	}
	return a
}

type pair [2]int

func makeGrid(h, w int) [][]bool {
	index := make([][]bool, h, h)
	data := make([]bool, h*w, h*w)
	for i := 0; i < h; i++ {
		index[i] = data[i*w : (i+1)*w]
	}
	return index
}