In a certain code, the nth letter (n ≠ 15) of the English alphabet is coded as rth letter of it, where r is the remainder when 3n + 5 is divided by 26. (For instance, the 12th letter L is coded as L since 3.12 + 5 = 41 leaves remainder 15 when divided by 26 and O is the fifteenth letter). The inverse process is used to decoding. Based on this, answer the question.