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Though, the solution of mjf worked and your's was printing a "#", once before the output, else verbatim the input, I appreciate your effort. :)

Thank you so much hergp and mjf :). It worked....

I have a file with the following content:
a-123-345-232
a-23343-4545-545
a-67676-45454-8787
a-129-8912-9824
b-564-78678-2322
b-5454-76767-8899
b-85554-124-152-29
c-34534-654543-323
(... and...