# File lib/quiz1/t/solutions/Glen M. Lewis/solitaire.rb, line 130
  def output_letter
    num = self[0].value
    card = self[num]
    return nil if (card.value == 53)
    num = (card.value > 26 ? card.value-26 : card.value)
    char = (num-1 + "A"[0]).chr
    puts "card.value=#{card.value}, char=#{char}" if $debug
    return char
  end