thread title as numbers

[klinzter]

hello,
I have been looking into buying a license for the vbulletin but first I would like to know a few things.. I have found an addon called (Thread Prefixes) from here https://vborg.vbsupport.ru/showthread.php?t=123033
it says that it allows your users to choose a thread prefix for each thread, so thats good..

now what im looking is for something just in case the user select a threat prefix he has to write a title correctly, I dont want them to put letter just numbers ex. 8 or 9 or 7 etc..

the threads prefix that I would be using are
singer name1 - rating
singer name2 - rating
singer name3 - rating
singer name4 - rating

so the user only has to type the rating... if they write a letter then say error or something!!

is this possible with the current vbulletin or I would have to order something else?