How to take the missing files

Hi all ,
am using unix ksh
I have a lots of files in /prb directory in the format as ..
..
..
..
MMRR0607.DAT_2012
MMRR0707.DAT_2012
MMRR0907.DAT_2012
MMRR1107.DAT_2012
...
..
MMRR3107.DAT_2012
MMRR0208.DAT_2012
..
I need the output as
Missing files are:-
MMRR0807.DAT_2012 (note 0807 refer date 08 month 07)
MMRR1007.DAT_2012
MMRR0108.DAT_2012

Can anybody know the solutions help me...

You have had this already discussed!!

Why again??

continue here....

what you tried so far ?

thanks pikk45 for reply ..
i didnt get the outputs so far ....

Are you even trying anything on ur own??