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
a2a1
a2g2
a2f2
a2e2
a2d2
a2c2
a2b2
a2a4
a2a3
a6a5
b6b5
h6h5
g7g5
g7g6
g8h8
g8h7
g8f8
g8f7

## Board State Fen
6k1/6p1/ppR4p/8/PP6/5K1P/r5P1/8 b - - 6 39
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
a2a1
a2g2
a2f2
a2e2
a2d2
a2c2
a2b2
a2a4
a2a3
a6a5
b6b5
h6h5
g7g5
g7g6
g8h8
g8h7
g8f8
g8f7

## Board State Fen
6k1/6p1/ppR4p/8/PP6/5K1P/r5P1/8 b - - 6 39
assistant
a2a4