def solve(n, a_line, b_line)
  a_colors = a_line.split
  b_colors = b_line.split

  (0...n).each do |i|
    return a_colors[i] unless a_colors[i] == b_colors[i]
  end
end

n = gets.to_i
a_line = gets.chomp
b_line = gets.chomp
puts solve(n, a_line, b_line)