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.

Example Input: iWGQpnsUkTbFeZiCQJ, tKTDrpnsUkTbFLS
Example Output: iWGQbfknpstueZiCQJ, tKTDrbfknpstuLS

Example Input: lSacNObvAhiTHNUFWeCxD, YCAhiTHNUFBCodAZ
Example Output: lSacNObvafhhintuWeCxD, YCafhhintuBCodAZ

Example Input: gaRUwn, fvRURt
Example Output:
garuwn, fvruRt