Speaking in Tongues (google code challange; qualification round 2012)

googlerese.rb

(1..gets.to_i).each do |i|
  (0...(str = gets.to_s.downcase).length).each do |j|
    if str[j] == 'a'
      str[j] = 'y'
    elsif str[j] == 'b'
      str[j] = 'h'
    elsif str[j] == 'c'
      str[j] = 'e'
    elsif str[j] == 'd'
      str[j] = 's'
    elsif str[j] == 'e'
      str[j] = 'o'
    elsif str[j] == 'f'
      str[j] = 'c'
    elsif str[j] == 'g'
      str[j] = 'v'
    elsif str[j] == 'h'
      str[j] = 'x'
    elsif str[j] == 'i'
      str[j] = 'd'
    elsif str[j] == 'j'
      str[j] = 'u'
    elsif str[j] == 'k'
      str[j] = 'i'
    elsif str[j] == 'l'
      str[j] = 'g'
    elsif str[j] == 'm'
      str[j] = 'l'
    elsif str[j] == 'n'
      str[j] = 'b'
    elsif str[j] == 'o'
      str[j] = 'k'
    elsif str[j] == 'p'
      str[j] = 'r'
    elsif str[j] == 'q'
      str[j] = 'z'
    elsif str[j] == 'r'
      str[j] = 't'
    elsif str[j] == 's'
      str[j] = 'n'
    elsif str[j] == 't'
      str[j] = 'w'
    elsif str[j] == 'u'
      str[j] = 'j'
    elsif str[j] == 'v'
      str[j] = 'p'
    elsif str[j] == 'w'
      str[j] = 'f'
    elsif str[j] == 'x'
      str[j] = 'm'
    elsif str[j] == 'y'
      str[j] = 'a'
    elsif str[j] == 'z'
      str[j] = 'q'
    end
  end
  puts "Case ##{i}: " + str
end