import sys
input = sys.stdin.readline

H,W=map(int,input().split())

A,x,y=map(int,input().split())
B,z,w=map(int,input().split())

MAP=[input().strip() for i in range(H)]

OK=[[[0]*W for i in range(H)] for j in range(2000)]

OK[A][x][y]=1

Q=[(A,x,y)]

while Q:
    now,x,y=Q.pop()

    for tx,ty in [(x+1,y),(x-1,y),(x,y+1),(x,y-1)]:
        if 0<=tx<H and 0<=ty<W:
            if MAP[tx][ty]==".":
                if now-1>0 and OK[now-1][tx][ty]==0:
                    OK[now-1][tx][ty]=1
                    Q.append((now-1,tx,ty))
            else:
                if now+1<2000 and OK[now+1][tx][ty]==0:
                    OK[now+1][tx][ty]=1
                    Q.append((now+1,tx,ty))

if OK[B][z][w]==1:
    print("Yes")
else:
    print("No")