DASH: str = '-'
ICON: str = '.|.'
WELCOME: str = 'WELCOME'

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

piramid = [(ICON * (i * 2 + 1)).center(m, DASH) for i in range(n // 2)]

print('\n'.join(piramid + [WELCOME.center(m, DASH)] + piramid[::-1]))