# File lib/quiz1/t/solutions/Thomas Leitner/solitaire.rb, line 40
  def output_letter
    a = @deck.first
    a = 53 if a.instance_of? String
    output = @deck[a]
    if output.instance_of? String
      nil
    else
      output -= 26 if output > 26
      (output + 64).chr
    end
  end