In a certain code language, 'STARDUST' is coded as '192011823687' and 'BACKDROP' is coded as '213112391211'. What is the code of 'PLATFORM' in that code language?

The logic followed here is: The first four letters are replaced by their standard positional values and the next four letters are replaced by the positional value of their opposite alphabets. S         T          A         R         D         U         S         T 19        20        1          18        23        6          8          7 STARDUST is written as ‘192011823687’ B         A         C         K         D         R         O         P 2          1          3          11        23        9          12        11 BACKDROP is written as ‘213112391211’ 'PLATFORM': P         L          A         T          F          O         R         M 16        12        1          20        21        12        9          14 'PLATFORM' is written as ‘16121202112914’