If step III of a given input be 'fly sky birds my su fur say'
What is the seventh step of the input?

In the given word and number arrangement machine rearranges the input with the logic that in step I, it shifts the largest number to the left most place and the last word coming in English alphabetical series to the right most place. In step II, it shifts the smallest number to the left most place and the next word (in reverse alphabetical order) to the right most. In step III 2^nd largest number it shifts to the left most place and so on.

Input : fun 89 at the 28 16 base camp 35 53 here 68
Step I : 89 fun at 28 16 base camp 35 53 here 68 the
Step II : 16 89 at fun 28 base camp 35 53 68 the here
Step III : 68 16 89 at 28 base camp 35 53 the here fun
Step IV : 28 68 16 89 at base 35 53 the here fun camp
Step V : 53 28 68 16 89 at 35 the here fun camp base
Step VI : 35 53 28 68 16 89 the here fun camp base at

In the given word and number arrangement machine rearranges the input with the logic that in step I, it shifts the largest number to the left most place and the last word coming in English alphabetical series to the right most place. In step II, it shifts the smallest number to the left most place and the next word (in reverse alphabetical order) to the right most. In step III 2^nd largest number it shifts to the left most place and so on.

Input : fun 89 at the 28 16 base camp 35 53 here 68
Step I : 89 fun at 28 16 base camp 35 53 here 68 the
Step II : 16 89 at fun 28 base camp 35 53 68 the here
Step III : 68 16 89 at 28 base camp 35 53 the here fun
Step IV : 28 68 16 89 at base 35 53 the here fun camp
Step V : 53 28 68 16 89 at 35 the here fun camp base
Step VI : 35 53 28 68 16 89 the here fun camp base at

In the given word and number arrangement machine rearranges the input with the logic that in step I, it shifts the largest number to the left most place and the last word coming in English alphabetical series to the right most place. In step II, it shifts the smallest number to the left most place and the next word (in reverse alphabetical order) to the right most. In step III 2^nd largest number it shifts to the left most place and so on.

Input : fun 89 at the 28 16 base camp 35 53 here 68
Step I : 89 fun at 28 16 base camp 35 53 here 68 the
Step II : 16 89 at fun 28 base camp 35 53 68 the here
Step III : 68 16 89 at 28 base camp 35 53 the here fun
Step IV : 28 68 16 89 at base 35 53 the here fun camp
Step V : 53 28 68 16 89 at 35 the here fun camp base
Step VI : 35 53 28 68 16 89 the here fun camp base at

After careful analysis of the given input and various steps of rearrangement it is evident that in each step one word and one number are rearranged. The word are rearranged from left in alphabetical order and the numbers are rearranged from the right in descending order but in the final step the word get rearranged in alphabetical order in reserves manner and number appear in descending order.

Input : 31 rise gem 15 92 47 aim big 25 does 56 not 85 63 with moon
Step I : aim 31 rise gem 15 47 big 25 does 56 not 85 63 with moon 92
Step II : big aim 31 rise gem 15 47 25 does 56 not 63 with moon 92 85
Step III : does big aim 31 rise gem 15 47 25 56 not with moon 92 85 63
Step IV : gem does big aim 31 rise 15 47 25 not with moon 92 85 63 56
Step V : moon gem does big aim 31 rise 15 25 not with 92 85 63 56 47
Step VI : not moon gem does big aim rise 15 25 with 92 85 63 56 47 31
Step VII : rise not moon gem does big aim 15 with 92 85 63 56 47 31 25
Step VIII : with rise not moon gem does big aim 92 85 63 56 47 31 25 15

After careful analysis of the given input and various steps of rearrangement it is evident that in each step one word and one number are rearranged. The word are rearranged from left in alphabetical order and the numbers are rearranged from the right in descending order but in the final step the word get rearranged in alphabetical order in reserves manner and number appear in descending order.

Input : 31 rise gem 15 92 47 aim big 25 does 56 not 85 63 with moon
Step I : aim 31 rise gem 15 47 big 25 does 56 not 85 63 with moon 92
Step II : big aim 31 rise gem 15 47 25 does 56 not 63 with moon 92 85
Step III : does big aim 31 rise gem 15 47 25 56 not with moon 92 85 63
Step IV : gem does big aim 31 rise 15 47 25 not with moon 92 85 63 56
Step V : moon gem does big aim 31 rise 15 25 not with 92 85 63 56 47
Step VI : not moon gem does big aim rise 15 25 with 92 85 63 56 47 31
Step VII : rise not moon gem does big aim 15 with 92 85 63 56 47 31 25
Step VIII : with rise not moon gem does big aim 92 85 63 56 47 31 25 15

slow dig hak pat dhurwa ran vi

V

after a close look we can observe that it is the sum of the digits that plays main role here rather than the number itself.
From this given data we can observe the pattern that the number that has lowest sum of digits shifts its position towards left and this process continues.

In this type of question backward progress is not a right approach as the number whose sum is smallest interchange its position, and there is only one shift per step hence given any step we can not determine the input.