N=int(input())
A=list(map(int,input().split()))
B=list(map(int,input().split()))
A.sort()
B.sort()

L=set()
diff=0
for i in range(N-1):
    diff+=abs(A[i+1]-B[i])
ans=diff
L.add(A[0])
for i in range(N-1):
    diff-=abs(A[i+1]-B[i])
    diff+=abs(A[i]-B[i])
    if ans>diff:
        ans=diff
        L=set()
        L.add(A[i+1])
    elif ans==diff:
        L.add(A[i+1])

print(len(L))
print(*sorted(L))