Designer Door Mat

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    n, m = map(int, input().split())
    center_text = "WELCOME".center(m, '-')
    pattern = '.|.'
    center_row = int(n / 2)
    rug_step = 2
    
    rug_width = 1
    for i in range(n):
        if i == center_row:
            print(center_text)
            rug_step *= -1
        else:
            print((pattern * rug_width).center(m, '-'))
        
        rug_width += rug_step