NM = input().split()
N,M = int(NM[0]), int(NM[1])
decoration = ".|."
# Upper cone
for i in range(N//2):
    print((i*decoration+decoration+i*decoration).center(M,"-"))
# middle 
print("WELCOME".center(M,"-"))
#Lower cone
for i in range (N//2):
    print(((N//2-i-1)*decoration + decoration + (N//2-i-1)*decoration ).center(M,"-"))