N,M = map(int,input().split())
for i in range(1, N, 2):
    print (( str('.|.')*i ).center(M, '-'))
print (str('WELCOME').center(M, '-'))
for i in range(N-2, -1, -2):
    print (( str('.|.')*i ).center(M, '-'))
N,M = map(int,input().split())
for i in range(1, N, 2):
    print (( str('.|.')*i ).center(M, '-'))
print (str('WELCOME').center(M, '-'))
for i in range(N-2, -1, -2):
    print (( str('.|.')*i ).center(M, '-'))