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C1.cpp
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C1.cpp
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//https://codeforces.com/contest/1382/problem/C1
#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<vi> vvi;
typedef vector<vl> vvl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
typedef vector<vpi> vvpi;
typedef vector<vpl> vvpl;
typedef set<int> si;
typedef multiset<int> msi;
typedef set<ll> sl;
typedef multiset<ll> msl;
#define clrcin cin.ignore(numeric_limits<streamsize>::max(),'\n');
#define GOGOGO ios::sync_with_stdio(false); cin.tie(nullptr);
#define BYEBYE return 0;
#define all(cn) (cn).begin(), (cn).end()
#define rep(i, n) for (int i = 0; i < n; ++i)
#define repk(i, k, n) for(int i = k; i < n; ++i)
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define popcnt __builtin_popcount
#define gcd std::__detail::__gcd
#define lcm std::__detail::__lcm
const int INFI = 1e9 + 5;
const ll INFL = 4e18 + 5;
void solve();
int main()
{
GOGOGO
int t; cin >> t; while(t--) {solve();}
BYEBYE
}
void solve()
{
int n;
cin >> n;
string a, b; cin >> a >> b;
vector<int> out;
for(int i = n - 1; i >= 0; --i)
{
if (a[i] == b[i]) continue;
else
{
out.push_back(i+1);
out.push_back(1);
out.push_back(i+1);
}
}
cout << out.size() << " ";
for(auto c : out)
{
cout << c << " ";
}
cout << endl;
}