If in the word 'PROBLEMATIC', all the consonants are replaced by their previous letter and all the vowels are replaced by their next letter according to the English alphabetical series, and then all the vowels and repeated letters are eliminated, and the remaining letters are arranged in ascending alphabetical order from left to right, which letter appears fifth from the right end?

Each vowel in the word (Left) GRAVITY (Right) is changed to the letter immediately following it in the English alphabetical order and each consonant is changed to the letter immediately preceding it in the English alphabetical order. Which of the following letters will be second from the right in the new group of letters thus formed?

Suppose the first and second letters of the English alphabet interchange their positions, the third and fourth interchange, and so on up to the end (Z). If all the vowels (A, E, I, O, U) are removed from this new arrangement, which letter will be third to the right of the eighth letter from the right end?