N,M = input().split(" ")
N = int(N)
M = int(M)
count = 0
l1 = []
for i in range(0,int((N-1)/6)):
    for j in range(0,int(M),3):
        count+=1                              
        if count%2==0 and count<int(N):
            l1.append("-"*int((M-j)/2)+".|."*int(count-1)+"-"*int((M-j)/2)) 

for i in range(0,len(l1)):
    print(l1[i])
            
print(("-"*int((M-7)/2))+"WELCOME"+("-"*int((M-7)/2)))                        #N

for i in range(len(l1),0,-1):
    print(l1[i-1])

def doorMat(n, m):
    result = ""

    if n % 2 == 0:
        return "Error: N is not natural odd number"

    if m / 3 != n:
        return "Error: M is not 3 times of N"

    mid_row = n // 2
    mid_col = m // 2

    def pattern_creator(row):
        sep = "|.."
        mid_symbol = "|"

        half_pat_minus_mid = "." + (row * sep)
        dashes = (mid_col - len(half_pat_minus_mid)) * "-"

        temp_result = (
            dashes + half_pat_minus_mid + mid_symbol + half_pat_minus_mid[::-1] + dashes
        )
        return temp_result

    for row in range(mid_row):
        result += "\n" + pattern_creator(row)

    dashes = (m - 7) // 2 * "-"
    temp_result = dashes + "WELCOME" + dashes

    result += "\n" + temp_result

    for row in range(mid_row - 1, -1, -1):
        result += "\n" + pattern_creator(row)

    print(result[1:])


if __name__ == "__main__":
    inp = list(input().split(" "))
    n = int(inp[0])
    m = int(inp[1])

    doorMat(n, m)

s1,s2 = input().split()

x='WELCOME'
y='---'
z='.|.'
size = ((int(s1)-1)//2)
top=size
for i in range(size):
    print(y*(top-i)+((2*(i+1))-1)*(z)+(y*(top-i)))
print(x.center(int(s2),'-'))
for i in range(size):
    print(y*(i+1)+((2*(top-i))-1)*(z)+(y*(i+1)))

s1,s2 = input().split()

x='WELCOME'
y='---'
z='.|.'
size = ((int(s1)-1)//2)
top=size
for i in range(size):
    print(y*(top-i)+((2*(i+1))-1)*(z)+(y*(top-i)))
print(x.center(int(s2),'-'))
for i in range(size):
    print(y*(i+1)+((2*(top-i))-1)*(z)+(y*(i+1)))