n = int(input())
a = sorted(list(map(int,input().split())))
b = sorted(list(map(int,input().split())))

acc1 = [0]
for i in range(n-1):
    acc1.append(acc1[-1] + abs(a[i]-b[i]))
acc2 = [0]
for i in range(n-1):
    acc2.append(acc2[-1] + abs(a[i+1]-b[i]))

inf = 1<<61
min_ = inf
ans = set()

for i in range(n):
    cost = acc1[i] + acc2[-1] - acc2[i]
    if cost < min_:
        min_ = cost
        ans = set([a[i]])
    elif cost == min_:
        ans.add(a[i])
print(len(ans))
print(*ans)