s = input()
ss = ''
res = ''
index = 0

for i in s:
    if i.isalpha():
        ss += i
ss = sorted(ss,key=str.upper)

for k in range(len(s)):
    if s[k].isalpha():
        res += ss[index]
        index += 1
    else:
        res += s[k]
print(res)