from collections import deque
dxy = zip([1, 0, -1, 0], [0, 1, 0, -1])
H, W = map(int, raw_input().split())
A, Sy, Sx = map(int, raw_input().split())
B, Gy, Gx = map(int, raw_input().split())
M = [raw_input() for i in xrange(H)]

que = deque([(A, Sx, Sy)])
used = [[[False]*51 for i in xrange(51)] for j in xrange(max(A, B) + 100)] 

while que:
    a, x, y = que.popleft()
    if used[a][x][y]: continue
    used[a][x][y] = True
    if Gx == x and Gy == y and a == B:
        print "Yes"
        break
    for dx, dy in dxy:
        nx, ny = x + dx, y + dy
        if 0 <= nx < W and 0 <= ny < H:
            na = a + (1 if M[ny][nx] == "*" else -1)
            if na <= 0 or na >= max(A, B) + 100: continue
            if used[na][nx][ny]: continue
            que.append((na, nx, ny))
else:
    print "No"