source_code: import java.io.OutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.PrintWriter;
  import java.util.InputMismatchException;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.io.InputStream;
  
  /**
   * Built using CHelper plug-in
   * Actual solution is at the top
   *
   * @author caoash
   */
  public class Main {
      public static void main(String[] args) {
          InputStream inputStream = System.in;
          OutputStream outputStream = System.out;
          FastScanner in = new FastScanner(inputStream);
          PrintWriter out = new PrintWriter(outputStream);
          BObtainingTheString solver = new BObtainingTheString();
          solver.solve(1, in, out);
          out.close();
      }
  
      static class BObtainingTheString {
          public void solve(int testNumber, FastScanner br, PrintWriter pw) {
              int n = br.nextInt();
              String s = br.nextString();
              String t = br.nextString();
              char[] sarr = new char[n];
              char[] tarr = new char[n];
              int[] sAppear = new int[26];
              int[] tAppear = new int[26];
              for (int i = 0; i < s.length(); i++) {
                  sarr[i] = s.charAt(i);
                  tarr[i] = t.charAt(i);
                  sAppear[s.charAt(i) - 'a']++;
                  tAppear[t.charAt(i) - 'a']++;
              }
              for (int i = 0; i < 26; i++) {
                  if (sAppear[i] != tAppear[i]) {
                      pw.println(-1);
                      pw.close();
                  }
              }
              ArrayList<Integer> ans = new ArrayList<Integer>();
              for (int i = 0; i < n; i++) {
                  char curr = tarr[i];
                  for (int j = i + 1; j < n; j++) {
                      if (sarr[j] == curr) {
                          for (int k = j; k > i; k--) {
                              ans.add(k);
                              char temp = sarr[k - 1];
                              sarr[k - 1] = sarr[k];
                              sarr[k] = temp;
                          }
                          break;
                      }
                  }
              }
              pw.println(ans.size());
              for (int e : ans) {
                  pw.print(e + " ");
              }
              pw.close();
          }
  
      }
  
      static class FastScanner {
          private InputStream stream;
          private byte[] buf = new byte[1024];
          private int curChar;
          private int numChars;
          private FastScanner.SpaceCharFilter filter;
  
          public FastScanner(InputStream stream) {
              this.stream = stream;
          }
  
          public int read() {
              if (numChars == -1) {
                  throw new InputMismatchException();
              }
              if (curChar >= numChars) {
                  curChar = 0;
                  try {
                      numChars = stream.read(buf);
                  } catch (IOException e) {
                      throw new InputMismatchException();
                  }
                  if (numChars <= 0) {
                      return -1;
                  }
              }
              return buf[curChar++];
          }
  
          public int nextInt() {
              int c = read();
              while (isSpaceChar(c)) {
                  c = read();
              }
              int sgn = 1;
              if (c == '-') {
                  sgn = -1;
                  c = read();
              }
              int res = 0;
              do {
                  if (c < '0' || c > '9') {
                      throw new InputMismatchException();
                  }
                  res *= 10;
                  res += c - '0';
                  c = read();
              } while (!isSpaceChar(c));
              return res * sgn;
          }
  
          public String nextString() {
              int c = read();
              while (isSpaceChar(c)) {
                  c = read();
              }
              StringBuilder res = new StringBuilder();
              do {
                  if (Character.isValidCodePoint(c)) {
                      res.appendCodePoint(c);
                  }
                  c = read();
              } while (!isSpaceChar(c));
              return res.toString();
          }
  
          public boolean isSpaceChar(int c) {
              if (filter != null) {
                  return filter.isSpaceChar(c);
              }
              return isWhitespace(c);
          }
  
          public static boolean isWhitespace(int c) {
              return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
          }
  
          public interface SpaceCharFilter {
              public boolean isSpaceChar(int ch);
  
          }
  
      }
  }
  
  