How many numbers are there between ‘understand’ and ‘flower’ in step-IV? 

Study the given information and answer the questions: When a word and number arrangement machine is given an input line of words and numbers, it rearranges them following a particular rule. The following is an illustration of input and rearrangement. Input: 67 over 23 dark 96 around 59 sweet 46 morning east 15 79 umpire Step-I: around 67 over 23 dark 96 59 sweet 46 morning east 79 umpire 15 Step-II: around 96 67 over 23 dark 59 46 morning east 79 umpire sweet 15 Step-III: around 96 east 67 over dark 59 46 morning 79 umpire 23 sweet 15 Step-IV: around 96 east 79 67 over dark 59 46 umpire morning 23 sweet 15 Step-V: around 96 east 79 over 67 dark 59 umpire 46 morning 23 sweet 15 Step-VI: around 96 east 79 over 67 59 umpire dark 46 morning 23 sweet 15 Step-VII: around 96 east 79 over 67 umpire 59 dark 46 morning 23 sweet 15 Input: 53 broccoli 37 unjust 63 igloo 42 flower 18 plants 92 understand trumpet 87