A word and number arrangement machine when given an input line of words and numbers rearranges them following a particular rule in each step. The following is an illustration of input and rearrangement.
Input: go now 53 39 18 for again 66
Step 1 : 66 go now 53 39 18 for again
Step 2 : 66 again go now 53 39 18 for
Step 3 : 66 again 53 go now 39 18 for
Step 4 : 66 again 53 for go now 39 18
Step 5 : 66 again 53 for 39 go now 18
Step 6 : 66 again 53 for 39 go 18 now

Q:

Input: how two 38 23 87 43 room over
Which of the following steps will be the last?

• 1
  4
• 2
  6
• 3
  5
• 4
  7