# frozen_string_literal: true

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

accepts = []
MEMBERS.each do |member|
  FOODS.each_with_index do |food, index|
    accepts << index if food[0] <= member[0] && food[1] >= member[1]
  end
end
FOODS_WITH_NUM = accepts.group_by(&:itself).map { |i, j| [i, j.size] }

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

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

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

puts RESULT