In this task, you are given two strings A,B. You must perform the following operations to generate the required output list: (i) Find the longest common substring in the strings A and B, (ii) Convert this substring to all lowercase and sort it alphabetically, (iii) Replace the substring at its respective positions in the two lists with the updated substring.

OBAxdf, LbAxIF
OBaxdf, LbaxIF
1. Longest common substring in OBAxdf and LbAxIF are Ax.
2. Converting the substring to all lowercase and sorting it alphabetically, we get a list ['a', 'x'].
3. Replacing the substring at its respective positions in the two lists, we get OBaxdf, LbaxIF.