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 = [(A, Sx, Sy)]
used = set()

while que:
    a, x, y = que.pop(0)
    if (a, x, y) in used: continue
    used.add((a, x, y))
    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 >= 1100: continue
            if (na, nx, ny) in used: continue
            que.append((na, nx, ny))
else:
    print "No"