I want to use the Bulk Mail example script but convert it to sendmail to a range of start with letters. For example: sendmail if records fetched Last_Name startswith A through L. 

Example Bulk Email Code:

2. emp  =  Employees[(age > input.age_1 && age < input.age_2)];
3. users = "";
4. for each x in emp
5. {
6.     sendmail
7.     (
8.         To       :  x.Email 
9.         From     :  zoho.adminuserid 
10.         Subject  :  "welcome" 
11.         Message  :  "" 
12.     )
13.     users = users + " -------- " + x.Email;
14. }
15. info "mail sent to the following users :" + users;

I have tried everything I can think of but none of my scripts work. Do I need to convert the first letter to a number and then use greater than and less than comparison?

If so, how do I convert a letter to a number?

Thanks,

Bryan