# using python's .center method:
height, width = map(int, input().split())

pattern_list: list[str] = []

for i in range(1, height, 2):
    pattern_list.append((".|." * i).center(width, "-"))

print(*pattern_list, sep="\n")
print("WELCOME".center(width, "-"))
print(*pattern_list[::-1], sep="\n")

# vs

# calculating patterns manually:
height, width = map(int, input().split())

pattern_list: list[str] = []

for i in range(1, height, 2):
    dash_length: int = (width - (i * 3)) // 2
    dash_line: str = "-" * dash_length
    line: str = dash_line + (".|." * i) + dash_line

    pattern_list.append(line)

welcome_dash_length: int = (width - 7) // 2
welcome_dash_line: str = "-" * welcome_dash_length

print(*pattern_list, sep="\n")
print(welcome_dash_line + "WELCOME" + welcome_dash_line)
print(*pattern_list[::-1], sep="\n")