# Write a program that accepts a comma separated sequence of words as
# input and prints the words in a comma-separated sequence after sorting them alphabetically.
# Suppose the following input is supplied to the program:
# without,hello,bag,world
# Then, the output should be:
# bag,hello,without,world

_STR_INPUTS = input().split(",")

print(",".join(sorted(_STR_INPUTS)))