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
a5a4
d5d4
e5e1
e5e2
e5e3
e5e4
e5f5
e5e8
e5e7
e5e6
d7e8
d7e7
d7d8
d7c8
d7c7

## Board State Fen
8/3k1p2/5R2/p2prPp1/6K1/2P5/2P5/8 b - - 1 49
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
a5a4
d5d4
e5e1
e5e2
e5e3
e5e4
e5f5
e5e8
e5e7
e5e6
d7e8
d7e7
d7d8
d7c8
d7c7

## Board State Fen
8/3k1p2/5R2/p2prPp1/6K1/2P5/2P5/8 b - - 1 49
assistant
d7e7