title: Printing out frequency of letters instead of how many times?
body: <p>I'm trying to change my code so that it prints how the frequency of the letters and not how many there is e.g. "I am a man I am a man" should give the same answer as "I am a man" since the relative proportions of each letter to the whole sequence is the same.</p>
  
  <p>So the desired output would be:</p>
  
  <p>Letter A: Count: 0.43<br>
  Letter I: Count: 0.14<br>
  Letter M: Count: 0.29<br>
  Letter N: Count: 0.14<br></p>
  
  <p>So the count will always add up to 1.0.</p>
  
  <p>At the moment, my code just counts and displays how many times the letter appears, is this simple to change?</p>
  
  <p>//</p>