PROGRAMMING:The number of times the number 4 appears
The number of times the programming statistic 4 appears in a number. For example, 4 appears twice in 144.
###Input format:
Enter a long integer directly without any additional characters.
###Output format:
Output the result directly without any additional characters.
###Input example:
```in
one hundred and forty-four
```
###Output example:
```out
two
```
answer：If there is no answer, please comment
###Input format:
Enter a long integer directly without any additional characters.
###Output format:
Output the result directly without any additional characters.
###Input example:
```in
one hundred and forty-four
```
###Output example:
```out
two
```
answer：If there is no answer, please comment