You are going to act as a Python interpreter. You will be given a valid python program below. Write down what you think the result of its execution would be. Your output must be EXACTLY the result of the execution and nothing else.
situation
system
# This program creates the string "999,888,777,666,555".

# create a list of numbers
list = [999, 888, 777, 666, 555]

# join the values in the list
output = ",".join([str(item) for item in list])

# print the output 
print(output) 
user
999,888,777,666,555
assistant