In a certain code language, ‘MUTUAL’ is written as ‘OXVXCO’

In a certain code language, ‘MUTUAL’ is written as ‘OXVXCO’ and ‘REASON’ is written as ‘THCVQQ’. How will ‘SERIES’ be written in that language?
एक निश्चित कूट भाषा में ‘MUTUAL’ को ‘OXVXCO’ लिखा जाता है और ‘REASON’ को ‘THCVQQ’ लिखा जाता है उस भाषा में ‘SERIES‘ को कैसे लिखा जाएगा?