string = input()
ascii = list(chr(i) for i in range(128))

lower = sorted([s for s in string if s in ascii[97:123]])
upper = sorted([s for s in string if s in ascii[65:91]])
odd = sorted([s for s in string if s in ascii[48:58] and int(s) % 2 != 0])
even = sorted([s for s in string if s in ascii[48:58] and int(s) % 2 == 0])

print("".join(lower + upper + odd + even))