n, m = map(int, input().split())
sym = 1

for x in range(n):
        if x < n//2:
            print((sym*".|.").center(m,"-"), end="")
            sym += 2
        elif x == n//2:
            print("WELCOME".center(m,"-"), end="")
        else:
            sym -= 2
            print((sym*".|.").center(m,"-"), end="") 
        print("")