So say I have a task like this:Construct a Turing machine transforming the word u to the word v byt  removing all the sequences of form ba from the word u. Input  alphabet = {a,b,c}. Example: for IN cabbaacba, OUT cac.And my problem always is: can I leave blank characters in place of ba sequences in tasks like this so that in the end, I have something like $ca \Phi \Phi \Phi \Phi c \Phi \Phi$ on the tape or do I have to work on the tape in such a way that I end up with, for example cac, written consecutively, without blanks?
Clarification for a class of Turing machine problems
turing machines
The question does not mention replacing ba by spaces.     It does not say that you can have spaces between the symbols in the output word. Is the blank character even in the output language?