In a certain code language, 'MENTOR' is written as 'NVMGLI' and 'DIARY' is written as 'WRZIB'. How will 'SHIMLA' be written in that language?

Let's analyze the pattern by looking at the pairs of opposite letters (pairs that sum up to 27 in terms of alphabetical positions):M $\leftrightarrow$ NE $\leftrightarrow$ VN $\leftrightarrow$ MT $\leftrightarrow$ GO $\leftrightarrow$ LR $\leftrightarrow$ ISimilarly, for DIARY:D $\leftrightarrow$ WI $\leftrightarrow$ RA $\leftrightarrow$ ZR $\leftrightarrow$ IY $\leftrightarrow$ BApplying the same opposite letter rule to SHIMLA:S $\leftrightarrow$ HH $\leftrightarrow$ RI $\leftrightarrow$ RM $\leftrightarrow$ NL $\leftrightarrow$ OA $\leftrightarrow$ ZSo, SHIMLA is written as HSRNOZ.