def parse_num(N) -> int:
    n = 1
    i = input().find("#")
    for _ in range(N-1):
        inp = input()
        if len(inp)-1 > i and inp[i+1] == "#":
            i += 1
            n *= 2
        else:
            i -= 1
            n = 2*n+1
    return n


s = 0
for _ in range(2):
    N = int(input(""))
    s += parse_num(N)

# Print back the s
indexes = [] # from the back/bottom
w = 0
width = 0
while s > 1:
    if s%2:
        v = +1
        s -= 1
    else:
        v = -1
    s /= 2

    indexes.append(v) # if s is even go left-up
    w += v
    if abs(w) > width:
        width = abs(w)
width += 1
# print(f"{width=}")
# print(f"{indexes=}")
# print(f"{w=}")
# Build output
print(len(indexes)+1)
a = max(0, w)
b = width-a-1
print("."*a + "#" + "."*b)
for i in indexes:
    a -= i
    b += i
    print("."*a + "#" + "."*b)