In the word “ASSUMPTION,” replace every vowel with its immediately succeeding…

In the word “ASSUMPTION,” replace every vowel with its immediately succeeding letter and every consonant with its immediately preceding letter. In “METICULOUS,” replace each letter after N in the alphabet with its immediately succeeding letter and each letter before N with its immediately preceding letter. Write the transformed second word after the transformed first word, then remove each later repetition while retaining the first occurrence of every letter. Which letter is sixth from the right end of the resulting sequence?