Machine Input-Output — quick quiz

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: 18 blue 52 green 37 red 64 white Step I: blue 18 52 green 37 red 64 white Step II: blue 18 green 52 37 red 64 white Step III: blue 18 green 37 52 red 64 white Step IV: blue 18 green 37 red 52 64 white Step V: blue 18 green 37 red 52 white 64 Step V is the last step of the rearrangement. As per the rules followed in the above steps, find the appropriate step for the following input: Input: 29 cat 71 dog 43 fish 85 bird What will be Step III?