题解 | #字符串排序#

try:
    while True:
        s = input()
        a = ''
        for i in s:
            if i.isalpha():
                a+=i
        b = sorted(a,key=str.upper)
        index = 0
        d = ''
        for i in range(len(s)):
            if s[i].isalpha():
                d+=b[index]
                index+=1
            else:
                d+=s[i]
        print(d)
except:
    pass