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
e4a4
e4b4
e4c4
e4d4
e4e1
e4e2
e4e3
e4h4
e4g4
e4f4
f5g6
f5g5
f5g4
f5f6
f5f4
f5e6

## Board State Fen
8/8/8/4pk2/4r3/R7/5K2/8 b - - 11 52
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
e4a4
e4b4
e4c4
e4d4
e4e1
e4e2
e4e3
e4h4
e4g4
e4f4
f5g6
f5g5
f5g4
f5f6
f5f4
f5e6

## Board State Fen
8/8/8/4pk2/4r3/R7/5K2/8 b - - 11 52
assistant
e4f4