title: Letter Cyphering
body: <p>I am very lost on this, so any help would be appreciated.  </p>
  
  <p>I am trying to take sentences as inputs and return an output with all of the letters 3 places after the value given.  So "A" would turn into "D", "B" into "E" and so on.  </p>
  
  <p>I think would start out with values like:</p>
  
  <pre><code>Alphabet = ('a'..'z').split('')
  function Cyphering
     precypheredLeters = inputSentence.split('')
     precypheredLeters.each do |x|
         if 
  </code></pre>
  
  <p>After that bit of code I want to give "x" an index value (like if "x" is equal to the letter "C" the index value should be 3, then I can add 3 more onto that turning it into "F".</p>
  
  <p>Also if my inputSentence is "Ruby Red !@#$", how do I return the value for spaces and symbols if I want them to remain the same?</p>
  
  <p>And if a letter input is "Z", i'd want it to go from Z => 26 to C => 3, and "Y" would turn into "B".</p>
  
  <p>Thanks!</p>