PROGRAMMING:Strange formula

In the following formula, each geometry represents a natural number.
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If I tell you the number of '-', can you tell me the number of '-'?
Please write a program, input the natural number represented by ★, if the problem has a solution, output the natural number represented by [; If the problem has no solution, output "None".
####Input format
>Natural number represented by
####Output format
>Natural number represented by
####Input sample 1
```in
one hundred
```
####Output sample 1
```out
nine
```
####Input sample 2
```in
one hundred and fifty
```
####Output sample 2
```out
None
```







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