S = input()
low = ""
up = ""
odd = ""
even = ""
for i in S:
    if i.islower():
        low += i
    elif i.isupper():
        up += i
    elif i.isdigit():
        if int(i) % 2 == 1:
            odd += i
        else:
            even += i
            
low = sorted(low)
up = sorted(up)
odd = sorted(odd)
even = sorted(even)
print("".join(low+up+odd+even))