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
c5b5
c5c4
c5h5
c5g5
c5f5
c5e5
c5d5
c5c8
c5c7
c5c6
h6h5
f7f5
f7f6
g7g5
g7g6
f8g8
f8e8
f8e7

## Board State Fen
5k2/5pp1/7p/pPr5/8/1Pp1PP1P/2R2KP1/8 b - - 0 40
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
c5b5
c5c4
c5h5
c5g5
c5f5
c5e5
c5d5
c5c8
c5c7
c5c6
h6h5
f7f5
f7f6
g7g5
g7g6
f8g8
f8e8
f8e7

## Board State Fen
5k2/5pp1/7p/pPr5/8/1Pp1PP1P/2R2KP1/8 b - - 0 40
assistant
c5b5