https://codeforces.com/contest/1015/problem/B

冒泡排序？？？？

/*
*@Author:   STZG
*@Language: C++
*/
#include <bits/stdc++.h>
#include<iostream>
#include<algorithm>
#include<cstdlib>
#include<cstring>
#include<cstdio>
#include<string>
#include<vector>
#include<bitset>
#include<queue>
#include<deque>
#include<stack>
#include<cmath>
#include<list>
#include<map>
#include<set>
//#define DEBUG

using namespace std;
typedef long long ll;
const int N=10000;
const double PI = acos(-1.0);
const double EXP = 1E-8;
const int INF = 0x3f3f3f3f;
int t,n,m;
string str1,str2;
int main()
{
#ifdef DEBUG
	freopen("input.in", "r", stdin);
	//freopen("output.out", "w", stdout);
#endif
    scanf("%d",&n);
    cin>>str1>>str2;
    vector<int>ans;
    for(int i=0;i<n;i++){
        if(str1[i]==str2[i])    continue;
        int pos=-1;
        for(int j=i+1;j<n;j++){
            if(str1[j]==str2[i]){
                pos=j;
                break;
            }
        }
        if(pos==-1){
            cout<< -1 <<endl;
            return 0;
        }
        for (int j = pos - 1; j >= i; --j) {
			swap(str1[j], str1[j + 1]);
			ans.push_back(j);
		}
    }
    cout << ans.size() << endl;
	for (int  it=0;it<ans.size();it++) cout << ans[it]+1 << " ";
	cout << endl;
    //cout << "Hello world!" << endl;
    return 0;
}