Definition: Given a document, generate a short title of the document. The title should convey the main idea/event/topic about which the document is being written. Note that URLs in the text have been replaced with [Link].
Input: Goldman Sachs CEO Lloyd Blankfein  has bitcoin on  his  mind  a day after reports broke that  his  firm was considering setting up a bitcoin trading operation.
The billionaire banker tweeted on Tuesday that  he  wasn't completely sure about  his  stance on the red-hot cryptocurrency.
 Blankfein  said  he 's "still thinking about bitcoin" and that  he  was not flat out endorsing or denouncing the digital currency. Here's the full tweet:
Still thinking about #Bitcoin. No conclusion - not endorsing/rejecting. Know that folks also were skeptical when paper money displaced gold. â Lloyd Blankfein (@lloydblankfein) October 3  2017

Lloyd Blankfein says he 's 'still thinking about bitcoin'