Designer Door Mat

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    n,m = map(int,((input()).split(' ')))

    for i in range(n//2): pt = '.|.'*(2*i+1) print(pt.center(m,'-'))

    print('WELCOME'.center(m,'-'))

    for i in range((n//2)-1,-1,-1): pt = '.|.'*(2*i+1) print(pt.center(m,'-'))