def design(n,m):
    for i in range(n//2):
        print((((2*i)+1)*(".|.")).center(m, "-"))
    print("WELCOME".center(m, "-"))
    for i in range(n//2):
        print((((2*(n//2-i))-1)*(".|.")).center(m, "-"))
if __name__ == "__main__":
    n, m = input().split()
    design(int(n), int(m))