Write a program that removes all non$-$alphabetic characters from the given input.

Ex: If the input is:

$-$Hello, $1$ world$$!$

the output is:

Helloworld

Your program must define and call the following function that takes a string as a parameter and returns the string without any non$-$alphabetic characters.

string RemoveNonAlpha$($string userString$)$

$547014\mathrm{.}3581748.$qx$3$zqy$7$