In a certain code language, BARREN is written as FDVUIQ. How will MOSTLY be written in that language?

The logic followed here is as follows: 1st, 3rd and 5th letters of the word are replaced by 4th succeeding letter in the alphabetical series. 2nd, 4th and 6th letters of the word are replaced by 3rd succeeding letter in the alphabetical series. Code for ‘ BARREN’ B + 4 = F A + 3 = D R + 4 = V R + 3 = U E + 4 = I N + 3 = Q Thus, the code is FDVUIQ. Code for ‘ MOSTLY’ M + 4 = Q O + 3 = R S + 4 = W T + 3 = W L + 4 = P Y + 3 = B Thus, the code is QRWWPB.