题解 | #字符串排序#

while True:
    try:
        a=input()
        b=''
        for i in a:
            if i.isalpha():
                b+=i
            b=sorted(b,key=str.upper)
            b=list(b)
        for i in range(len(a)):
            if a[i].isalpha():
                continue
            else:
                b.insert(i,a[i])
        b=''.join(b)
        print(b)
    except:
        break