N = int(input())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
A_idx = []
for i in range(N):
    A_idx.append((A[i], i))
    
A_idx.sort()
B.sort()
now = 0
for i in range(N - 1):
    now += abs(B[i] - A_idx[i][0])
    
mi = now
ans = [A_idx[-1][0]]
for i in range(N - 2, 0, -1):
    now -= abs(B[i] - A_idx[i][0])
    now += abs(B[i] - A_idx[i + 1][0])
    if now < mi:
        ans = [A_idx[i][0]]
        mi = now
    elif now == mi:
        ans.append(A_idx[i][0])
        
ans = list(set(ans))
ans.sort()
print(len(ans))
print(*ans)