PROGRAMMING:Pointer to achieve statistical number of words
Input an English sentence (no more than 80 characters) in a line and output the number of words in the sentence. The words are separated by spaces. Except for spaces, they are considered as words (including symbols).
###Input example:
```in
This is a C program. <<< =22= ,,, END
```
###Output example:
```out
nine
```
answer：If there is no answer, please comment
###Input example:
```in
This is a C program. <<< =22= ,,, END
```
###Output example:
```out
nine
```
answer：If there is no answer, please comment