N, M = map(int, input().split())

# Top half
for i in range(1, N - 1, 2):
    print(('.|.' * i).center(M, '-'))
    
# WELCOME line
print('WELCOME'.center(M, '-'))

# Bottom half
for i in range(N - 2, 0, -2):
    print(('.|.' * i).center(M, '-'))