What is the sum of all the digits of the number which is 4th smallest in step III?

Study the following information carefully and answer the given questions. A word and number arrangement machine when given an input of words and numbers rearranges them following a particular rule. The following is an illustration of input and rearrangement. Input: 95738   68537   87843   38594   58234   73544 Step I: 35   95738     68537      87843   58234   73544 Step II: 523   35     95738      68537    87843     73544 Step III: 537   523     35         95738     87843    73544 Step IV: 735   537     523        35         95738     87843 Step V: 73       735     537       523        35         95738      Step VI: 573     73       735     537       523        35          Step VI is the last step of the above input. As per the rules followed in the above steps find the appropriate step for the given input. Input: 74936     58967    49772     83529      36947    66723