from collections import defaultdict
dic = defaultdict(list)
from itertools import accumulate
N = int(input())
A = list(map(int,input().split()))
B = list(map(int,input().split()))
for i,a in enumerate(A,start = 1):
    dic[a].append(i)
A.sort()
B.sort()
C = [0]
D = [0]
for i in range(N-1):
    C.append(abs(A[i]-B[i]))
    D.append(abs(A[i+1]-B[i]))
C = list(accumulate(C))
D = list(accumulate(D))
ans = 10 ** 12
ans2 = set()
for i in range(N):
    tmp = C[i] + D[-1] - D[i]
    if ans > tmp:
        ans = tmp
        ans2 = {A[i]}
    elif ans == tmp:
        ans2.add(A[i])
print(len(ans2))
print(*sorted(list(ans2)))