'''Question: 
 Write a Python program that accepts a hyphen-separated sequence of words as input and prints the words in a hyphen-separated sequence after sorting them alphabetically.
'''

# Python code: 

items=[n for n in input().split('-')]

items.sort()

print('-'.join(items))



'''Output sample: 
green-red-black-white                                                                                         

black-green-red-white 

'''