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

Second:

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

Third:

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

Expression: The top left corner has a solid line of four X's, followed by a row of three X's. The third row from the top has three X's in the middle and two empty cells on the right. The fourth row has two X's on the left and three empty cells on the right. The bottom row has one X on the left and four empty cells on the right.
Question: Which grid does the expression refer to?
Start with the tag "Answer: ", followed by your selection. Omit any other text.

Answer: First
assistant
Answer: First
assistant