n, m = map(int, input().split())

x=n//2
for i in range(x):
    a=".|."*(2*(i+1)-1)
    print(a.center(m,"-"))
print("WELCOME".center(m, "-"))
for i in range(x):
    b=".|."*((2*(x-i)-1))
    print(b.center(m,"-"))