word = input()

lower_case = [char for char in word if char.islower()]
upper_case = [char for char in word if char.isupper()]
digit_odd_case = [char for char in word if char.isdigit() and int(char) % 2]
digit_even_case = [char for char in word if char.isdigit() and int(char) % 2 == 0]

lower_case = ''.join(sorted(lower_case))
upper_case = ''.join(sorted(upper_case))
digit_even_case = ''.join(sorted(digit_even_case))
digit_odd_case = ''.join(sorted(digit_odd_case))

print(lower_case + upper_case + digit_odd_case + digit_even_case)