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 5n - 6 is divided by 26. (For instance, the 7th letter G is coded as L since 5.7 - 6 = 29 leaves remainder 3 when divided by 26 and C is the third letter). The inverse process is used to decoding. Based on this, answer the question.