Language C programming, just use library stdio.h only, USE MERGE SORTING

Sorting Lowercase

Given sentence S. Sort the lowercase letters in S ascendingly whilst ignoring other characters.

Format Input

The only line of input contains S. S may not only contain lowercase letters. It is guaranteed that there will be at least one lowercase letter in S.

Format Output

The output of this problem will be the sorted version of S.

Constraints

1 |S| 100

Sample Input (standard input)

Hello , Jojo here from BinusOJ . com

Sample Output (standard output)

ceeefhijllmmnooooorrsu