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))

h, w = map(int, input().split())
for i in range(1,h,2):
    print((".|."*i).center(w,"-"))
print("WELCOME".center(w,"-"))
for i in range(h-2,0,-2):
    print((".|."*i).center(w,"-"))

def is_valid_input(height: int, width: int) -> bool:
    return (
        isinstance(height, int)
        and isinstance(width, int)
        and height % 2 == 1
        and width == height * 3
        and 5 < height < 101
    )


def design_doormat(height: int, width: int) -> list[str]:
    if not is_valid_input(height, width):
        raise ValueError("Invalid input: N must be odd, M must be 3*N")

    lines = []

    # Top
    for i in range(1, height, 2):
        pattern = ".|." * i
        lines.append(pattern.center(width, "-"))

    # Center
    lines.append("WELCOME".center(width, "-"))

    # Bottom
    for i in range(height - 2, 0, -2):
        pattern = ".|." * i
        lines.append(pattern.center(width, "-"))

    return lines


if __name__ == "__main__":
    n, m = map(int, input().split())
    for line in design_doormat(n, m):
        print(line)

import math
N , M = map(int, input().split())
# M = 3*N  #because it will be done implicitly by hackerank, no need to ovrwrite

ro = math.floor(N/2)
for i in range(0 ,ro):
    print(('.|.'*(i*2+1)).center(M,'-'))
    
print('WELCOME'.center(M,'-'))

for i in range(ro-1,-1,-1):
    print(('.|.'*(i*2+1)).center(M,'-'))