#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  map<char, int> m1, m2;
  map<char, int>::iterator it1, it2;
  vector<int> v;
  string s, t;
  int n, i, j, ct = 0, len;
  cin >> n >> s >> t;
  for (i = 0; i <= n - 1; i++) {
    m1[s[i]]++;
    m2[t[i]]++;
  }
  if (m1.size() == m2.size()) {
    for (it1 = m1.begin(), it2 = m2.begin(); it1 != m1.end(); it1++, it2++) {
      if ((it1->first == it2->first) && (it1->second == it2->second)) ct++;
    }
    if (ct == m1.size()) {
      s = " " + s;
      t = " " + t;
      for (i = 1; i <= n; i++) {
        for (j = i; j <= n; j++) {
          if (t[i] == s[j]) break;
        }
        j--;
        for (; j >= i; j--) {
          swap(s[j], s[j + 1]);
          v.push_back(j);
        }
      }
      len = v.size();
      cout << len << "\n";
      for (i = 0; i <= len - 1; i++) cout << v[i] << " ";
      cout << "\n";
    } else
      cout << "-1\n";
  } else
    cout << "-1\n";
  return 0;
}
