import sys

h, w = map(int, input().split())

array = ["".join(list(input())) for x in range(h)]

flag = True
for h_i in range(1, len(array)-2):
    for w_i in range(1, len(array[h_i]) - 2):
        if array[h_i][w_i] == "#" and array[h_i+1][w_i] == "." and array[h_i][w_i+1] == "." and \
                array[h_i - 1][w_i] == "." and "." == array[h_i][w_i - 1]:
            print(h_i, w_i)
            print("No")
            sys.exit()

print("Yes" if flag else "No")
