You are given three grids, where each of them is 5 by 5 in size.
Grids have empty cells marked with "▢" and filled cells marked with "X".
You are also given a referring expression that describes one of the given grids.
Your task is to select the grid that matches the given referring expression.
Generate only the number (in text) of the grid that matches the given expression by selecting first, second, or third.

First:

X X ▢ ▢ X
X ▢ X ▢ ▢
X ▢ ▢ X ▢
▢ ▢ X ▢ ▢
▢ X ▢ X ▢

Second:

▢ ▢ ▢ ▢ X
X ▢ X ▢ ▢
▢ ▢ X ▢ X
X ▢ X ▢ ▢
X X ▢ ▢ X

Third:

▢ ▢ ▢ ▢ ▢
▢ ▢ ▢ ▢ ▢
▢ X ▢ X ▢
X X X ▢ X
X X X ▢ X

Expression: The grid with the first row having four empty cells followed by one filled cell, the second row starting with a filled cell followed by an empty one, then alternating between filled and empty cells, the third row having the first two cells empty, followed by a filled cell, an empty one, and a filled one, the fourth row starting with a filled cell followed by an empty one, then alternating between filled and empty cells, and the last row starting with two filled cells, followed
Question: Which grid does the expression refer to?
Start with the tag "Answer: ", followed by your selection. Omit any other text.

Answer: Second
assistant
Answer: Second
assistant