Converstion routine

Hi Experts,

Any one have Idea about the Conversation routine.

It should be conver the data into 2-2-3-3

Suppose I have data like 1010200212 it should be conver in to 10-10-200-212

If any standard Conversation routine is avilable please let me know I will use the same in ny Z domain

Thnx in Advance,

Sam.