s = input()

ss = []
for ch in s:
    if ch.isalpha():
        ss.append(ch)
ss.sort(key = lambda x : x.lower())

ans = ""
j = 0
for i, ch in enumerate(s):
    if ch.isalpha():
        ans += ss[j]
        j += 1
    else:
        ans += ch
print(ans)