PROGRAMMING:Flip Words
This topic requires the input string flip
###Input format:
Enter a line of string, all the content to maintain the relative position, the word flip. The total length of the string is unknown, the number of words is unknown, and each word is no more than 20 letters. Test data to ensure that the input characters only contain English letters and spaces.
###Output format:
After the operation of the string flip, because the title of the old slacker, remember to end with a space Oh (Bushi
###Input example:
```in
hello world
```
###Output example:
```out
olleh dlrow
```
answer：If there is no answer, please comment
###Input format:
Enter a line of string, all the content to maintain the relative position, the word flip. The total length of the string is unknown, the number of words is unknown, and each word is no more than 20 letters. Test data to ensure that the input characters only contain English letters and spaces.
###Output format:
After the operation of the string flip, because the title of the old slacker, remember to end with a space Oh (Bushi
###Input example:
```in
hello world
```
###Output example:
```out
olleh dlrow
```
answer：If there is no answer, please comment