I sold 339 American Depositary Shares of Alcatel-Lucent and received an additional payment for the sale of 339 rights. I received $ 56 for the sale of the rights.

Although I was not aware that rights were attached to the original shares it seems that the basis of the rights is the amount received at the time of the sale. Is this correct? And if so, is my new basis for the original ADS reduced by $56?