单项选择题

听下面一段对话，回答下列问题。
M: Excuse me, I think you are in my seat.
W: Sorry, but it says 7A on my boarding card.
M: Oh, uh, right, I asked for window seat, you see.
W: Yes, so did I. What’s your seat number
M: Let’s see, oh, it’s 8A.
W: Yes, I guess you are in the seat behind me.
M: Oh, yes, sorry about that.

What is the seat number of the man().

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