PROGRAMMING:Output integer in reverse order by recursion

This topic requires reading in a positive integer n, and then write the recursive function reverse (int n) to realize the positive integer output in reverse order.
###Input format:
The input gives a positive integer n in one line.
###Output format:
For each group of inputs, the reverse order number of n is output in a row.
###Input example:
```in
twelve thousand three hundred and forty-five
```
###Output example:
```out
fifty-four thousand three hundred and twenty-one
```







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