PROGRAMMING:Prime number of sfy

Enter n, M（ 0 < n < = 200, 0 < m < = 200). Output the number of left and right prime numbers from n to m (including N and m);
###Input format:
Input data two positive integers n, M
###Output format:
Output the number of prime numbers between N and m.
###Input example:
Here is a set of inputs. For example:
```in
4 10
100 200
```
###Output example:
The corresponding output is given here. For example:
```out
two
twenty-one
```







answer：If there is no answer, please comment