Given the available moves based on the current board state in FEN notation, think carefully about which move would be best, then make that move. Be sure to note your color indicated in the FEN notation before deciding.
## Available Moves
a2b1
a2f7
a2e6
a2d5
a2c4
a2b3
a5a6
a5a4

## Board State Fen
8/5P2/8/k1K5/8/8/b7/8 b - - 0 67
system
You are a chess playing AI.
user
Given the available moves based on the current board state in FEN notation, think carefully about which move would be best, then make that move. Be sure to note your color indicated in the FEN notation before deciding.
## Available Moves
a2b1
a2f7
a2e6
a2d5
a2c4
a2b3
a5a6
a5a4

## Board State Fen
8/5P2/8/k1K5/8/8/b7/8 b - - 0 67
assistant
a2f7