from collections import *
from itertools import *
from functools import *
from heapq import *
import sys, math

input = sys.stdin.readline

H,W = map(int,input().split())
A,sx,sy = map(int,input().split())
B,gx,gy = map(int,input().split())
M = [list(input())[:-1] for _ in range(H)]
vis = defaultdict(lambda:False)
vis[(sx,sy,A)] = True
v = deque()
v.append((sx,sy,A))
def nb(x,y):
    tmp = []
    if x+1<H:
        tmp.append((x+1,y))
    if x-1>=0:
        tmp.append((x-1,y))
    if y+1<W:
        tmp.append((x,y+1))
    if y-1>=0:
        tmp.append((x,y-1))
    return tmp
while v:
    x,y,h = v.popleft()
    if h>1300:
        continue
    for ix,iy in nb(x,y):
        if M[ix][iy]=='.':
            if h==1:
                continue
            if vis[(ix,iy,h-1)]:
                continue
            vis[(ix,iy,h-1)]=True
            v.append((ix,iy,h-1))
        else:
            if vis[(ix,iy,h+1)]:
                continue
            vis[(ix,iy,h+1)]=True
            v.append((ix,iy,h+1))
if vis[(gx,gy,B)]:
    print('Yes')
else:
    print('No')