s = input()

lower = sorted([c for c in s if c.islower()])

upper = sorted([c for c in s if c.isupper()])

odd_digits = sorted([c for c in s if c.isdigit() and int(c) % 2 == 1])

even_digits = sorted([c for c in s if c.isdigit() and int(c) % 2 == 0])

print(''.join(lower + upper + odd_digits + even_digits))