A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself.
Write a Python program which takes a set of positive numbers from the input and returns the sum of the prime numbers in the given set. The sequence will be ended with a negative number.
I/O Format:
Input format: [numbers]*[Space]<nega1ve number>
Output format:<sum_of_primes>
Note that:
1- Sample input and output files are provided.
2- [x]* means, zero or more elements of x
