Capgemini Mainframe Real Time Scenario Based Interview Question.

Input file consist of product id and it can repeat multiple times so we need to write sequence no for every record of product id. Whenever product id changes we need to reset the sequence to 1 again. Input file data A001 A001 A001 B003 B003 Output file data. _______ A001 1 A001 2 A001 3 B003 1 B003 2