N = int(input())
A = sorted(list(map(int, input().split())))
B = sorted(list(map(int, input().split())))
ans = set()
ans_v = 0

for i in range(N - 1):
    ans_v += abs(A[i] - B[i])
now = ans_v
ans = {A[N - 1]}
for i in range(N - 2, -1, -1):
    # print(i, now, ans, A[i])
    now -= abs(A[i] - B[i])
    now += abs(A[i + 1] - B[i])
    # print(i, A[i], now)
    if(now == ans_v):
        ans.add(A[i])
    elif(now < ans_v):
        ans = {A[i]}
        ans_v = now
print(len(ans))
print(*sorted(list(ans)))