class Calc0201
  def initialize(args)
    args = args.map { |l| l.chomp.split(/\s+/) }
    @sa, @pa, @xa = args.shift
    @sb, @pb, @xb = args.shift
  end

  def calc
    k = [@pa.size, @pb.size].max
    @pa.rjust(k, '0') <=> @pb.rjust(k, '0')
  end

  def run
    case calc
    when 0
      -1
    when 1
      @sa
    when -1
      @sb
    end
  end
end

puts Calc0201.new(STDIN.readlines).run if __FILE__ == $0