What part of the transaction is scriptSig in? I was reading this paper 
https://web.archive.org/web/20140331191527/http://bitcoinhistory.net/Technical_Papers/ProgrammingBitcoinTransactionScripts.pdf
and I have the following question:

ScriptPubKey accompanies a transaction output and specifies under which conditions it can be claimed. ScriptSig accompanies a transaction input and is used to prove that the referenced output can be rightfully claimed.

So in page 2 the ScriptSig should be in Input TX and ScriptPubKey should be in output TX? Author says that scriptA is ScriptSig.
I was confused by that too. Here's the picture with some more labels on it.