my_str = input()
new_str =''

for i in my_str:
    if i.isalpha():
        new_str += i

sort_str = sorted(new_str,key=str.upper)

index = 0
last_str = ''

for i in range(len(my_str)):
    if my_str[i].isalpha():
        last_str += sort_str[index]
        index += 1
    else:
        last_str += my_str[i]

print(last_str)