title: Running through different parts of the input
body: <p>I don't really know how to explain this so I'll just give an example and do my best at explaining.
  For example I get this as input from the client:</p>
  
  <p>"TREGPRABCNPRX" (Without pressing enter)</p>
  
  <p>Now I want to take the first 3 letters and put them into different chars (a1, a2, a3 : 'T' , 'R' , 'E').
  Then after I'm done with them I'll move to the following 3 and save their value into (a1, a2, a3 with the values : 'G', 'P', 'R'), it will do so until it encounters a 'X' at the end .
  The trick is that you can't use strings / arrays.</p>
  
  <p>I hope the explanation was good enough for you to understand.</p>