In a certain code language ‘BIOLOGY’ is coded as ‘YTROLLB’ then, what is the code for ‘OPERATION’ in the same code language?

All the alphabets are first arranged in alphabetical order from the left end. All the alphabets are replaced with their reverse alphabet in the English alphabetical series. For BIOLOGY: B         I           O         L          O         G         Y B         G         I           L          O         O         Y Y         T          R         O         L          L          B Code for ‘BIOLOGY’ is YTROLLB. For OPERATION: O         P         E         R         A         T          I           O         N A         E         I           N         O         O         P         R         T Z          V         R         M         L          L          K         I           G Code for ‘OPERATION’ is ZVRMLLKIG.