A record file that was never closed

You asked an AI to add today's follower count to the end of a record file and to check how many records there are. This is the code it gave you. followers.txt already exists with the content below. Predict the output without running the code.

Code

today = 371
log = open("followers.txt", "a")
log.write(f"{today}\n")

reader = open("followers.txt")
lines = reader.readlines()
reader.close()
print("Number of records:", len(lines))
print("Last record:", lines[-1].strip())

File followers.txt

340
352