I have a problem in sorting

If your using windows:
Open cmd.exe (program files>accessories>command prompt)
use the sort command in this syntax:

sort "path name and or file name"

you may also use file exports like this for example:

sort birthdays.txt > sorted birthdays.txt (single forward will write over old files and make new ones)
sort birthdays.txt >> sorted birthdays.txt (use double forwards to made amendments to the file)

the "/R" function will reverse the sort order, for example:

sort /R birthdays.txt


thats all, hope this helps. I cant do much else with the information given.