title: Write a function GeneratePassword which accepts two arguments, an integer and a character string consisting of letters (a-z) and digits (0-9)
body: <p>Write a function <code>GeneratePassword</code> which accepts two arguments, an integer and a character string consisting of letters (a-z) and digits (0-9).</p>
  
  <p>When <code>GeneratePassword(5,'abc0123')</code> is called, it should return a random string of 5 characters taken from 'abc0123'.  </p>
  
  <p>For Example : <code>GeneratePassword(7,'abczxc012394')</code> could return any of the following outputs : </p>
  
  <blockquote>
    <p>2c00acb<br>
    2c23z93<br>
    030b2a4</p>
  </blockquote>