Designer Door Mat

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    n, m = map(lambda x: int(x), input().split(" "))
    pattern = ".|."
    for i in range(n//2):
        print((f'{pattern}'*(2*i+1)).center(m,"-"))
    print("WELCOME".center(m,"-"))
    for i in range(n//2,0,-1):
        print((f'{pattern}'*(2*i-1)).center(m,"-"))