先挑出来干净的,排序,然后再见机插回去
while True:
try:
s = input()
a = ''
for i in s:
if i.isalpha():
a += i
b = sorted(a, key=str.upper) #注意这个排序方法,upper后无()
index = 0
d = ''
for i in s:
if i.isalpha():
d = d + b[index]
index += 1
else:
d = d + i
print(d)
except:
break