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
c2a2
c2b2
c2c1
c2h2
c2g2
c2f2
c2e2
c2d2
c2c4
c2c3
c5d6
c5d5
c5c6
c5b6
c5b5

## Board State Fen
8/8/8/2k5/6R1/6P1/2r5/6K1 b - - 0 58
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
c2a2
c2b2
c2c1
c2h2
c2g2
c2f2
c2e2
c2d2
c2c4
c2c3
c5d6
c5d5
c5c6
c5b6
c5b5

## Board State Fen
8/8/8/2k5/6R1/6P1/2r5/6K1 b - - 0 58
assistant
c5d6