n = int(a)
m = int(b)
mid = (n // 2) + 1  
d = '-'
l = '.|.'

for i in range(1, n + 1):
    if i < mid:
        num_blocks = (2 * (i - 1)) + 1
        print((l * num_blocks).center(m, d))
    elif i == mid:
        print("WELCOME".center(m, d))
    else:  
        num_blocks = (2 * (n - i)) + 1
        print((l * num_blocks).center(m, d))