def main():
    n = int(input())
    lst = [list(map(int, input().split())) for _ in range(n)]

    m = int(input()) + 1  # 1-indexedにするため
    c = [0] * m
    for i in range(1, m):
        x, y = map(int, input().split())
        c[i] = len([{a, b} for a, b in lst if x <= a and y >= b])

    if max(c) == 0:
        print(0)
    else:
        for x in [i for i in range(m) if c[i] == max(c)]:
            print(x)


if __name__ == "__main__":
    main()