n,m = map(int,input().split())
top_bottom_loop = (n - 1) // 2
# top layer
dot_pattern = 1
for i in range(top_bottom_loop):
    hyphen = (m - 3 * dot_pattern) // 2
    print('-' * hyphen + ".|." * dot_pattern + '-' * hyphen)
    dot_pattern += 2

# mid layer
hyphen_welcome = (m - 7) // 2
print("-" * hyphen_welcome + "WELCOME" + "-" * hyphen_welcome)

# bottom layer
dot_pattern -= 2 
for i in range(top_bottom_loop):
    hyphen = (m - 3 * dot_pattern) // 2
    print('-' * hyphen + ".|." * dot_pattern + '-' * hyphen)
    dot_pattern -= 2