title: Check whether a list of hexadecimal values is sequential or not
body: <p>Want a function / statement, to check whether all the values of <code>mylist</code> are sequential or not, which is <strong>hexadecimal</strong> list.
  For example:</p>
  
  <pre><code>def checkmylist(mylist):
      #code returns True or False
  
  
  mylist1 = ['03', '04', '05', '06', '07', '08', '09', '0a', '0b', '0c','0d', '0e', '0f']
  mylist2 = ['03', '05', '06', '07', '08', '09', '0a', '0b', '0c','0d', '0e', '0f']
  
  checkmylist(mylist1)
  #expected to returns pass
  checkmylist(mylist2)
  #expected to returns fail
  </code></pre>