title: How to convert a string to integer
body: <p>Example : 
  a = 1
  b = 2
  c = 3
  ..
  ..
  z = 26
  aa = 27
  ab = 28</p>
  
  <p>how to convert another string into an integer? for example i want to convert 'lmao' to an integer. please help me :) thank you.
  in pascal :)</p>