Those are MIK language and not meaningful to anyone who is not familiar with MIK. Depending on your settings in MIK, you will need to sort on the CDJ to the place where you write these MIK values. 1A or 10B is not a "real" key it's just what someone made up to make things easier for you and me. If you set MIK to write your key to the comments section of your file, then sort the tracks by comments on the CDJ.