PROGRAMMING:Nested loops the sum of prime numbers

This topic requires reading in 2 integers a and B, and then output the sum of all prime numbers between the two numbers (excluding the input data).
###Input format:
Enter two positive integers separated by spaces
###Output format:
Output the sum of prime numbers between two numbers (excluding input data), if the input negative number has no output
###Input example:
Here is a set of inputs. For example:
```in
10 20
```
###Output example:
The corresponding output is given here. For example:
```out
sixty
```







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