#include <bits/stdc++.h>
using namespace std;
#define int long long
#define vi vector<int>
#define pb push_back
#define pir pair<int, int>
const int P = 1e9 + 7;
const int N = 1e3 + 7;
const int inf = 0x3f3f3f3f3f3f3f3f; // longlong
const int ing = 1e18;
// const int mod = 998244353;
// cout << fixed << setprecision(5) << number << endl;
// tuple
//prev(it)   next(it)
const int mod = 1e9 + 7;
int n, m, k;
int ax, bx, ay, by;
void solve()
{
	cin >> n;
	vector<int> vis(n + 1,0);
	vector<int> a(n + 1);
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
	}
	int u = a[1], cnt = 1; vis[1] = 1;
	//cout<<u<<" "<<vis[u]<<"?\n";
	while (vis[u]==0) {
		vis[u] = 1;
		u=a[u];
		cnt++;
	}
	if (cnt < n) {
		cout << n << "\n" << cnt << "\n";
		for (int i = 1; i <= n; i++) {
			if (vis[i]) {
				cout << i << " ";
			}
		}
		cout << "\n"; return;
	}
	else {
		cout << n - 2 << "\n";
		vector<int> ans;
		ans.push_back({ 1 });
		int k = a[1];
		while (a[k] != 2) {
			ans.push_back({ k }); k = a[k];
		}
		for (auto e : ans) {
			cout << e << " ";
		}
		cout << "\n";
	}
}
signed main()
{
	cin.tie(0)->sync_with_stdio(0);
	int _ = 1;
	cin >> _;
	while (_--)
	{
		solve();
	}
}