// Slower C++ solution:
#define _CRT_SECURE_NO_WARNINGS

#include <iostream>

#include <sstream>

#include <iomanip>

#include <cstdio>

#include <cstdlib>

#include <cmath>

#include <cctype>

#include <cstring>

#include <vector>

#include <list>

#include <queue>

#include <deque>

#include <stack>

#include <map>

#include <set>

#include <algorithm>

#include <iterator>

#include <bitset>

#include <ctime>

#include<complex>

using namespace std;



#define FOR(i,a,b) for (int i = (a); i < (b); i++)

#define RFOR(i,b,a) for (int i = (b)-1; i >= (a); i--)

#define ITER(it,a) for (__typeof(a.begin()) it = a.begin(); it != a.end(); it++)

#define FILL(a,value) memset(a, value, sizeof(a))



#define SZ(a) (int)a.size()

#define ALL(a) a.begin(), a.end()

#define PB push_back

#define MP make_pair



typedef long long LL;

typedef vector<int> VI;

typedef pair<int, int> PII;



const double PI = acos(-1.0);

const int INF = 1000 * 1000 * 1000 + 7;

const LL LINF = INF * (LL)INF;



const int MAX = 2 * 1000 * 100 + 47;



int A[MAX];

int B[MAX];



int A1[MAX];

int B1[MAX];

int L[MAX * 2];

int sz;

vector<int> g[MAX];

int IN[MAX];

int OUT[MAX];

int U[MAX];



int val = 0;

void dfs(int v)

{

	if (U[v]) return;

	U[v] = 1;



	if (OUT[v] > IN[v]) val += OUT[v] - IN[v];

	FOR(i, 0, SZ(g[v]))

	{

		int to = g[v][i];

		dfs(to);

	}

}



int main()

{

	//freopen("in.txt", "r", stdin);

	//freopen("out.txt", "w", stdout);

	ios::sync_with_stdio(false); cin.tie(0);

	int n;

	cin >> n;

	FOR(i, 0, n) cin >> A[i];

	FOR(i, 0, n) cin >> B[i];

	



	int y = 0;

	int x = 0;

	FOR(i, 0, n)

	{

		x ^= A[i];

		y ^= B[i];

		A1[i] = A[i];

		B1[i] = B[i];

	}



	A1[n] = x;

	B1[n] = y;

	sort(A1, A1 + n + 1);

	sort(B1, B1 + n + 1);

	bool ok = true;

	FOR(i, 0, n + 1)

	{

		if (A1[i] != B1[i])

		{

			ok = false;

			break;

		}

	}



	if (!ok)

	{

		cout << -1 << endl;

		return 0;

	}



	int ans = 0;

	FOR(i, 0, n)

	{

		if (A[i] != B[i]) ans++;

		L[sz++] = A[i];

		L[sz++] = B[i];

	}



	L[sz++] = x;

	sort(L, L + sz);

	sz = unique(L, L + sz) - L;

	

	FOR(i, 0, n)

	{

		A[i] = lower_bound(L, L + sz, A[i]) - L;

		B[i] = lower_bound(L, L + sz, B[i]) - L;

	}



	x = lower_bound(L, L + sz, x) - L;

	FOR(i, 0, n)

	{

		int a = A[i];

		int b = B[i];

		if (a == b) continue;

		g[a].push_back(b);

		g[b].push_back(a);



		OUT[b]++;

		IN[a]++;

	}



	val = 0;

	dfs(x);

	if (val != 0 && OUT[x] > IN[x]) val--;

	ans += val;



	FOR(i, 0, n)

	{

		//cout << SZ(g[i]) << endl;

		if (U[i] || SZ(g[i]) == 0) continue;



		val = 0;

		dfs(i);

		if (val == 0) val++;

		//cout << i << ": " << val << endl;

		ans += val;

	}



	cout << ans << endl;

}

// Faster C++ solution for the same problem (measured speedup: 6.566783812103623x):
#include<cstdio>

#include<cstring>

#include<algorithm>

#define MAXN 200000

using namespace std;

int n,a[MAXN+5],b[MAXN+5];

int lsh[MAXN+5],lcnt;

int vis[MAXN+5],setfa[MAXN+5];

int ru[MAXN+5],chu[MAXN+5];

bool sp[MAXN+5];

void Init()

{

	for(int i=0;i<=MAXN+3;i++)

		setfa[i]=i;

}

int Findfa(int x)

{

	if(x==setfa[x])

		return x;

	return setfa[x]=Findfa(setfa[x]);

}

void Union(int x,int y)

{

	int fx=Findfa(x),fy=Findfa(y);

	if(fx==fy)	return;

	setfa[fx]=fy;

}

int main()

{

	Init();

	scanf("%d",&n);

	int x=0;

	for(int i=1;i<=n;i++)

		scanf("%d",&a[i]),x^=a[i];

	for(int i=1;i<=n;i++)

		scanf("%d",&b[i]);

	for(int i=1;i<=n;i++)

		lsh[++lcnt]=a[i],lsh[++lcnt]=b[i];

	lsh[++lcnt]=x;

	sort(lsh+1,lsh+1+lcnt);

	lcnt=unique(lsh+1,lsh+1+lcnt)-lsh-1;

	x=lower_bound(lsh+1,lsh+1+lcnt,x)-lsh;

	for(int i=1;i<=n;i++)

	{

		a[i]=lower_bound(lsh+1,lsh+1+lcnt,a[i])-lsh;

		b[i]=lower_bound(lsh+1,lsh+1+lcnt,b[i])-lsh;

	}

	int ans=0;

	for(int i=1;i<=n;i++)

		if(a[i]!=b[i])

		{

			ru[a[i]]++,chu[b[i]]++;

			Union(a[i],b[i]);

			sp[a[i]]=sp[b[i]]=true;

			ans++;

		}

	if(ans==0)

	{

		printf("0\n");

		return 0;

	}

	int exist=false;

	for(int i=1;i<=lcnt;i++)

	{

		if(ru[i]==chu[i]-1)

		{

			if(i!=x)

			{

				printf("-1\n");

				return 0;

			}

		}

		else if(ru[i]==chu[i]+1)

		{

			if(exist==true)

			{

				printf("-1\n");

				return 0;

			}

			exist=true;

		}

		else if(ru[i]!=chu[i])

		{

			printf("-1\n");

			return 0;

		}

	}

	int cnt=0;

	for(int i=1;i<=lcnt;i++)

		if(Findfa(i)==i&&sp[i]==true)

			cnt++;

	if(cnt>=1)

		cnt--;

	if(ru[x]==0&&chu[x]==0)

		cnt++;

	ans+=cnt;

	printf("%d\n",ans);

	return 0;

}