import itertools
from collections import deque

H, W = map(int, input().split())
A, Si, Sj = map(int, input().split())
B, Gi, Gj = map(int, input().split())
M = [input() for _ in range(H)]


def point2int(h, w, x):
    """
    H*W*1200の空間で探索
    座標(h,w,x) →整数 1200*W*h+1200*w+x にエンコード
    """
    return 1200 * W * h + 1200 * w + x


Graph = [[] for _ in range(H * W * 1200)]
for h, w in itertools.product(range(H), range(W)):
    n = (1 if M[h][w] == '*' else -1)
    # 入る辺
    for dh, dw in [(1, 0), (0, 1), (-1, 0), (0, -1)]:
        if 0 <= h - dh < H and 0 <= w - dw < W:
            for x in range(1200):
                if 0 <= x - n < 1200:
                    Graph[point2int(h - dh, w - dw, x - n)].append(point2int(h, w, x))

S = point2int(Si, Sj, A)
G = point2int(Gi, Gj, B)

# dfs
d = deque([S])
visited = [False] * (H * W * 1200)
while d:
    v = d.pop()
    if v == G:
        print('Yes')
        break
    visited[v] = True
    for x in Graph[v]:
        if not visited[x]:
            d.append(x)
else:
    print('No')