Dexter and his experiments on prime

Dexter is in his laboratory experimenting with some integers. For his experiment, he needs all the prime divisors of the integer. He is too busy so he asks her sister Dee Dee to find the number of all the prime divisors. Dee Dee is too dumb to solve this problem on her own so she asks for your help. Your task is to simply print the number of prime divisors of a given number $n$. ###Input: - Firs