#include <bits/stdc++.h>
using namespace std;
int main() {
  int N;
  cin >> N;
  vector<int> a(N + 1);
  vector<int> b(N + 1);
  vector<int> c(N + 1);
  vector<int> d(N + 1);
  for (int i = 0; i < N; i++) {
    cin >> a[i];
    c[i] = a[i];
  }
  for (int i = 0; i < N; i++) {
    cin >> b[i];
    d[i] = b[i];
  }
  int x = 0;
  int y = 0;
  for (int i = 0; i < N; i++) {
    x ^= a[i];
  }
  for (int i = 0; i < N; i++) {
    y ^= b[i];
  }
  c[N] = x;
  d[N] = y;
  sort(c.begin(), c.end());
  sort(d.begin(), d.end());
  for (int i = 0; i < N + 1; i++) {
    if (c[i] != d[i]) {
      cout << -1 << endl;
      return 0;
    }
  }
  int ans = N;
  for (int i = 0; i < N; i++) {
    if (a[i] == b[i]) {
      ans--;
    }
  }
  cout << ans << endl;
}
