题解 | #字符串排序#

text = input()
s = ''
for i in text:
    if i.isalpha():
        s += i
s = sorted(s,key=str.upper)
b = ''
index = 0
for i in range(len(text)):
    if text[i].isalpha():
        b += s[index]
        index += 1
    else:
        b += text[i]
print(b)