# frozen_string_literal: true

#
# Array extension
#
class Array
  def accepts
    FOODS.map.with_index do |food, index|
      index if food[0] <= self[0] && food[1] >= self[1]
    end
  end
end

# ----------------------------------------------------------------- input

MEMBERS = gets.to_i.times.map { gets.chomp.split.map(&:to_i) }
FOODS = gets.to_i.times.map { gets.chomp.split.map(&:to_i) }

# ----------------------------------------------------------------- calc

FOODS_WITH_NUM = MEMBERS.map(&:accepts)
                        .flatten
                        .compact
                        .group_by(&:itself)
                        .map { |i, j| [i, j.size] }

MAXS = FOODS_WITH_NUM.filter do |_, j|
  j == ((FOODS_WITH_NUM.max_by { |_, k| k } || [nil, 0])[1])
end

RESULT = MAXS.empty? ? 0 : MAXS.map { |k, _v| k + 1 }.uniq

# ----------------------------------------------------------------- output

puts RESULT