import collections

a=int(input())
b=[]
for i in range(a):
    b.append([int(i) for i in input().split()])
    
c=int(input())
d=[]
for i in range(c):
    d.append([int(i) for i in input().split()])
e=[]
for i in b:
    for m,j in enumerate(d):
        if (i[0]>=j[0]) and (i[1]<=j[1]):
            e.append(m+1)

z=collections.Counter(e)

if len(z)==0:
    print(0)
else:
    for i in z:
        if max(z)==z[i]:
            print(i)