There are two words "EARTHBOUND" and "FACTORIES". In the word "EARTHBOUND" the letters that comes towards the left of B are changed into their immediate succeeding letter and the letters that comes towards the right of H changes into their immediate preceding letter according to the English alphabetical series. In the word "FACTORIES" the letter comes before N in alphabetical series are changes into their immediate succeeding letter and the remaining letters are changes into their immediate preceding letter according to the English alphabetical series. All the letters from both the rearranged words are combined and arranged according to the English alphabetical series from the left to the right. After that, all the repeated vowels and letters are dropped. Which letter will come fourth from the right end of the rearranged sequence?