n,m = input().split()
n=int(n) 
m=int(m)
k=m-3
l=1
o=k//2
while o>=3:
    print("-"*o + ".|."*l +"-"*o)
    o-=3
    l+=2

w = (m-7)//2
print("-"*w + "WELCOME" + "-"*w)

p=3
q=(m-6)//3
r=(m-3)//2
while p<=r:
    print("-"*p+".|."*q+"-"*p)
    p+=3
    q-=2