Directions: Read the given information carefully and answer the following questions.

If in the given word 'WORCESTERSHIRE' all the consonants are replaced by the next letter and all the vowels are replaced by the previous letter according to the English alphabetical series and all the letters are arranged in ascending order from left to right according to alphabetical order then find the difference between the number of letters repeated the maximum number of times and the letter repeated the minimum number of times?

Note: Letter appears once it not considered as repeated once.