#include<iostream>

#include<string>

#include<cstdio>

using namespace std;

string a, b;

int aa[], t, n;

bool flag1;

int main(){

    cin>>n;

    cin>>a>>b;

    int p=, q=;

    while(q<n){

        bool flag=;

        while(q<n&&a[p]==b[q]){++p; ++q;}

        while(p<n&&a[p]!=b[q]){++p; flag=;}

        if(flag&&p==n){flag1=; break;}

        for(int i=p;i>q;--i){

            swap(a[i], a[i-]);   aa[t++]=i;

        }

        p=q;

    }

    if(flag1)cout<<-<<endl;

    else {

        cout<<t<<endl;

        for(int i=;i<t;++i)

            cout<<aa[i]<<" ";

        cout<<endl;

    }

}