PROGRAMMING:Count the number of numeric characters in the string

Enter a string and count the number of numeric characters ('0 '...'9').
###Input format:
Enter a non empty string that ends with carriage return and is no more than 80 characters long in one line.
###Output format:
Output the number of numeric characters counted.
###Input example:
```in
Enter a string: It's 512?
```
###Output example:
```out
three
```







answer：If there is no answer, please comment