#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
#include <time.h>
#include <cstdlib>
#include <ctime>
#include <cstdio>
#include <cstring>

using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <iostream>

using namespace __gnu_pbds;
using namespace std;
template <class T>
using Tree =
    tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
// to erase in multiset-> less_equal<T> and 
// s.erase(s.find_by_order(s.order_of_key(x)))
// lower_bound(x)=>(cannot use the stl lower_bound function)
// ll idx = s.order_of_key(x)
// if(idx == s.size()) -> no lower_bound
// else lb = *s.find_by_order(idx) // as 0-indexing
// idx-1 will give highest value which is strictly less than x
// for upper_bound->do the same with (x+1)

typedef long long ll;
typedef long double ld;
typedef pair<int,int> p32;
typedef pair<ll,ll> p64;
typedef tuple<ll, ll, ll> t64;
typedef vector<t64> vt64;
typedef vector<vt64> vvt64;
typedef pair<double,double> pdd;
typedef vector<ll> v64;
typedef vector<int> v32;
typedef vector<vector<int> > vv32;
typedef vector<vector<ll> > vv64;
typedef vector<vector<p64> > vvp64;
typedef vector<p64> vp64;
typedef vector<p32> vp32;
typedef vector<vector<p32> > vvp32;
typedef vector<bool> vb;
ll mod =  1e9+7, MOD = 998244353;
double eps = 1e-12;
// #define forn(i,e) for(ll i = 0; i < e; i++)
#define FOR(s, e, i) for(int i = s; i <= e; i++)
// #define rforn(i,s) for(ll i = s; i >= 0; i--)
#define ROF(s ,e, i) for(int i = s; i >= e; i--)
#define coutAll(A) for(auto asdafas : A) cout <<  asdafas << " "; cout << "\n";
#define foutAll(A) for(auto asdafas : A) fout <<  asdafas << " "; cout << "\n";
#define cinAll(A) for(auto &asdafas : A) cin >>  asdafas;
#define finAll(A) for(auto &asdafas : A) fin >>  asdafas;
#define minpq priority_queue<ll, v64, greater<ll>>
#define maxpq priority_queue<ll> 
#define ln "\n"
#define dbg(x) cout<<#x<<" = "<<x<<ln
#define mp make_pair
#define mt make_tuple
#define pb push_back
#define fi first
#define se second
ll inf = LLONG_MAX;
#define fast_cin() ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define sz(x) ((ll)(x).size())
#define yes cout<<"YES\n"
#define no cout<<"NO\n"
using namespace std;
typedef long long ll;
typedef vector<ll> vll;
typedef vector<vector<ll>> vvll;
typedef pair<ll, ll> pll;
typedef pair<ll, ll> pii;
//#define MAXN 1000000

void solve(int it)
{
    int n; cin >> n;
    v64  pref(n + 1);
    vp64 A(n + 1);
    FOR(1, n, i){
        cin >> A[i].fi;
        A[i].se = i;
    }
    sort(all(A));
    FOR(1, n, i){
        pref[i] = pref[i-1] + A[i].fi;
    }
    ll p, q;
    cin >> p >> q;
    ll c = 1;
    ROF(n, 1, i){
        // if(i*q*A[i].fi <= p*(pref[i])){
        //     c = i;
        //     break;
        // }
        ll l = 1, r = i, res = -1;
        while(l <= r){
            ll mid = (l + r) / 2;
            ll m = i-mid+1;
            if(m*q*A[i].fi <= p*(pref[i]-pref[mid-1])){
                res = m;
                r = mid - 1;
            }else{
                l = mid + 1;
            }
        }
        c = max(c, res);
    }
    // cout << c << "\n";
    if(c == 1){
        cout << "0\n\n";
        return;
    }
    v32 ans;
    v32 pf(n + 2, 0);
    ROF(n, c, i){
        ll e = i-(c-1)+1;
        if(e > i) continue;
        ll sum = pref[i]-pref[e-1];
        ll l = 1, r = e-1, ps = -1;
        while(l <= r){
            ll mid = (l + r) / 2;
            if(c*q*A[i].fi <= p*(sum + A[mid].fi)){
                ps = mid;
                r = mid - 1;
            }else{
                l = mid + 1;
            }
        }
        if(ps!=-1){
            pf[ps]++;
            pf[i+1]--;
        }
    }
    // coutAll(pf);
    ll res = 0;
    FOR(1, n, i){
        res += pf[i];
        if(res == 0){
            ans.pb(A[i].se);
        }
    }
    sort(all(ans));
    cout << ans.size() << "\n";
    coutAll(ans);
    

}


int main()
{
    fast_cin();    
    ll t = 1;
    cin >> t;
    for(int it=1; it<=t; it++)
    {
        //cout << "Case " << it << ": ";
        solve(it);
    }
    return 0;
}