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
c8a8
c8b8
c8c1
c8c2
c8c3
c8c4
c8c5
c8c6
c8c7
c8h8
c8g8
c8f8
c8e8
c8d8
f4f5
e5e6
e4f3
e4e3
e4d4
e4d3

## Board State Fen
2R5/5pk1/6p1/r3P1P1/4KP2/8/8/8 w - - 25 84
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
c8a8
c8b8
c8c1
c8c2
c8c3
c8c4
c8c5
c8c6
c8c7
c8h8
c8g8
c8f8
c8e8
c8d8
f4f5
e5e6
e4f3
e4e3
e4d4
e4d3

## Board State Fen
2R5/5pk1/6p1/r3P1P1/4KP2/8/8/8 w - - 25 84
assistant
e4f3