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
a5a1
a5a2
a5a3
a5a4
a5d5
a5c5
a5b5
a5a8
a5a7
a5a6
f7g8
f7g7
f7f8
f7e8

## Board State Fen
8/5k2/3R4/r2N4/8/6K1/8/8 b - - 2 44
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
a5a1
a5a2
a5a3
a5a4
a5d5
a5c5
a5b5
a5a8
a5a7
a5a6
f7g8
f7g7
f7f8
f7e8

## Board State Fen
8/5k2/3R4/r2N4/8/6K1/8/8 b - - 2 44
assistant
a5a1