SBI PO 2018 Papers

Instructions
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. (All the numbers are two-digit numbers.)
Input : 42 prey burn 78 21 melt gulp 96 83 head
Step I : ban 23 42 prey 78 melt gulp 96 83 head
Step II : gap 44 ban 23 prey 78 melt 96 83 head
Step III : had 80 gap 44 ban 23 prey melt 96 83
Step IV : mat 85 had 80 gap 44 ban 23 prey 96
Step V : pay 98 mat 85 had 80 gap 44 ban 23
Step V is the last step of the above arrangement as the intended output of arrangement is obtained.
As per the rules followed in the given steps, find the appropriate steps for the given input.
Input : 61 rust 33 colt 86 four torn 28 49 leap