import sys
import io, os
input = sys.stdin.readline

def main():

    h, w = map(int, input().split())
    a, si, sj = map(int, input().split())
    b, ti, tj = map(int, input().split())

    M = [str(input().rstrip()) for i in range(h)]

    visit = [[False]*1051 for i in range(h*w)]
    from collections import deque
    q = deque([])
    s = si*w+sj
    t = ti*w+tj
    q.append((s, a))
    visit[s][a] = True
    while q:
        v, x = q.popleft()
        if v == t and x == b:
            break
        i, j = divmod(v, w)
        for di, dj in (-1, 0), (1, 0), (0, 1), (0, -1):
            ni, nj = i+di, j+dj
            if 0 <= ni < h and 0 <= nj < w:
                nv = ni*w+nj
                if M[ni][nj] == '*':
                    nx = x+1
                else:
                    nx = x-1
                if nx >= 1 and nx <= 1050 and not visit[nv][nx]:
                    q.append((nv, nx))
                    visit[nv][nx] = True
    if visit[t][b]:
        print('Yes')
    else:
        print('No')

if __name__ == '__main__':
    main()