#include <bits/stdc++.h>

using i64 = long long;

constexpr int N = 5e5 + 5, BASE = 13331, P = 1e9 + 7;

int T, n, L, R, x[N], a[N], pre[N], pw[N];
bool ban[N];
std::array<int, 2> S[N];

struct PersistentTree {
    static constexpr int N = 5e5 + 5, V = 3e7 + 5;
    int tot, root[N], ls[V], rs[V], h[V];
    void clear() { tot = 0; memset(root, 0, sizeof root); }
    void pushUp(int u, int l, int r) {
        int mid = (l + r) >> 1;
        h[u] = (1ll * h[ls[u]] * pw[r - mid] + h[rs[u]]) % P;
    }
    void build(int &u, int l, int r) {
        u = ++tot;
        if (l == r) return h[u] = 0, void();
        int mid = (l + r) >> 1;
        build(ls[u], l, mid), build(rs[u], mid + 1, r);
        pushUp(u, l, r);
    }
    void modify(int &u, int v, int l, int r, int pos, int val) {
        u = ++tot; ls[u] = ls[v], rs[u] = rs[v], h[u] = h[v];
        if (l == r) return h[u] += val, void();
        int mid = (l + r) >> 1;
        if (pos <= mid) modify(ls[u], ls[v], l, mid, pos, val);
        if (pos > mid)  modify(rs[u], rs[v], mid + 1, r, pos, val);
        pushUp(u, l, r);
    }
    bool compare(int u, int v, int l, int r) {
        if (l == r) return h[u] <= h[v];
        int mid = (l + r) >> 1;
        if (h[rs[u]] == h[rs[v]]) return compare(ls[u], ls[v], l, mid);
        return compare(rs[u], rs[v], mid + 1, r);
    }
} T1;

struct SegTree {
	#define ls(u) (u << 1)
	#define rs(u) (u << 1 | 1)
	int m, max[N << 2];
	int Max(int lhs, int rhs) {
		if (!lhs || !rhs) return lhs + rhs;
		return T1.compare(T1.root[lhs], T1.root[rhs], 1, n) ? rhs : lhs; 
	}
	void pushUp(int u) {
		max[u] = Max(max[ls(u)], max[rs(u)]);
	}
	void modify(int u, int l, int r, int pos) {
		if (l == r) return max[u] = pos, void();
		int mid = (l + r) >> 1;
		if (pos <= mid) modify(ls(u), l, mid, pos);
		if (pos > mid)  modify(rs(u), mid + 1, r, pos);
		pushUp(u);
	}
	int query(int u, int l, int r, int ql, int qr) {
		if (ql <= l && r <= qr) return max[u];
		int mid = (l + r) >> 1, ret = 0;
		if (ql <= mid) ret = Max(ret, query(ls(u), l, mid, ql, qr));
		if (qr > mid)  ret = Max(ret, query(rs(u), mid + 1, r, ql, qr));
		return ret;
	}
} T2;

namespace FastIO {
	static constexpr int SIZE = (1 << 20);
	char bufIn[SIZE], bufOut[SIZE], *p1, *p2, *pOut = bufOut;
	#define gc()  (p1 == p2 && (p2 = (p1 = bufIn) + fread(bufIn, 1, 1 << 20, stdin)), p1 == p2 ? EOF : *p1++)
	#define pc(c) (pOut - bufOut == SIZE && (fwrite(bufOut, 1, 1 << 20, stdout), pOut = bufOut), *pOut++ = c)

	template <typename T>
	inline void read(T &x) {
		x = 0; bool f = 0; char ch = gc();
		while(!isdigit(ch)) f |= (ch == '-'), ch = gc();
		while( isdigit(ch)) x = x * 10 + (ch - '0'), ch = gc();
		if (f) x = -x;
	}

	template <typename T, typename... Args>
	inline void read(T &x, Args &...args){ read(x); read(args...); }

	template <typename T = int>
	inline T read() {
		T x = 0; bool f = 0; char ch = gc();
		while(!isdigit(ch)) f |= (ch == '-'), ch = gc();
		while( isdigit(ch)) x = x * 10 + (ch - '0'), ch = gc();
		return f ? -x : x;
	}
	
	template <typename T>
	inline void write(T x) {
		if (x < 0) x = -x, pc('-');
		static T stk[40]; int tp = 0;
		do stk[tp++] = x % 10, x /= 10; while(x);
		while(tp) pc(stk[--tp] + '0');
	}

	template <typename T, typename... Args>
	inline void write(T x, Args ...args){ write(x); pc(' '); write(args...); }
	
	template <typename T> inline void writeln(T x) { write(x); pc('\n'); }	
	template <typename T> inline void writesp(T x) { write(x); pc(' '); }
	inline void flush() { fwrite(bufOut, 1, pOut - bufOut, stdout); }
};

using namespace FastIO;

void solve() {
	n = read(), L = read(), R = read();
	for (int i = 1; i <= n; i++) x[i] = read(), ban[i] = pre[i] = 0;
	for (int i = 1; i <= n; i++) a[i] = read();
	for (int i = 1; i <= n; i++) {
		S[i][0] = std::lower_bound(x + 1, x + 1 + n, x[i] - R) - x;
		S[i][1] = std::upper_bound(x + 1, x + 1 + n, x[i] - L) - x - 1;
	}
	T1.build(T1.root[0], 1, n), T1.modify(T1.root[1], T1.root[0], 1, n, a[1], 1);
	for (int i = 1; i <= (n << 2); i++) T2.max[i] = 0;
	T2.modify(1, 1, n, 1);
	for (int i = 2; i <= n; i++) {
		auto [l, r] = S[i];
		if (l <= r) pre[i] = T2.query(1, 1, n, l, r);
		if (!pre[i]) { ban[i] = 1; continue; }
		T1.modify(T1.root[i], T1.root[pre[i]], 1, n, a[i], 1);
		T2.modify(1, 1, n, i);
	}
	if (ban[n]) return writeln(-1), void();
	int cur = n; std::vector<int> ans;
	while (cur) {
		ans.push_back(a[cur]);
		cur = pre[cur];
	}
	std::sort(ans.begin(), ans.end(), std::greater<int>());
	writeln(ans.size());
	for (auto u : ans) writesp(u);
	pc('\n');
}

int main() {
	pw[0] = 1;
	for (int i = 1; i < N; i++) pw[i] = 1ll * pw[i - 1] * BASE % P;

	T = read();
	while (T--) solve();
	
	return flush(), 0;
}