#include <bits/stdc++.h>
using namespace std;
const int oo = 0x3f3f3f3f;
const int MAXN = 200010;
const double EPS = 1e-7;
inline int read() {
  char c = getchar();
  int x = 0, f = 1;
  while (c < '0' || c > '9') {
    if (c == '-') f = -1;
    c = getchar();
  }
  while (c >= '0' && c <= '9') {
    x = x * 10 + (c - '0');
    c = getchar();
  }
  return x * f;
}
char s[55], t[55];
int cnt[30], vis[55];
vector<int> pos[30];
vector<int> ans;
int main() {
  int n = read();
  scanf("%s", s + 1);
  scanf("%s", t + 1);
  for (int i = 1; i <= n; i++) cnt[s[i] - 'a']++;
  for (int i = 1; i <= n; i++) pos[t[i] - 'a'].push_back(i);
  int flag = 1;
  for (int i = 0; i < 26; i++)
    if (cnt[i] != (int)((pos[i]).size())) flag = 0;
  if (flag) {
    for (int i = 1; i <= n; i++) {
      for (int j = i; j <= n; j++) {
        if (s[j] == t[i]) {
          for (int k = j - 1; k >= i; k--) {
            swap(s[k], s[k + 1]);
            ans.push_back(k);
          }
          break;
        }
      }
    }
    cout << (int)((ans).size()) << endl;
    for (int i = 0; i < (int)((ans).size()); i++) cout << ans[i] << ' ';
  } else
    puts("-1");
  return 0;
}
