DuSiDo and DeeSiDO look alike, but DuSiDo lies only on Monday, Tuesday and Wednesday, whereas DeeSiDO lies only on Thursday, Friday and Saturday. They both tell the truth on Sunday. You come upon the two of them and they make the following statements.
A: I will lie tomorrow.
B: I lied yesterday and I will lie tomorrow.
Who is DuSiDo?