Which of the following is the last step for the following input? Input: 17 minus 8 is not always 9

Here the rule followed is: A keen watch of last step will help in determining the logic. Words and numbers get arranged alternately. Word with less no. of letters precedes words with more letters and in case of words with equal no. of letters,arrangement occurs according to that in dictionary,Numbers are getting arranged in ascending order. Thearrangement takes place in each step by interchanging. Input: 17 minus 8 is not always 9.The last step can be directly determined, using the above mentioned logic. Hence Last step: is 8 not 9 minus 17 always.