#include<cstdio>
#include<vector>
#include<queue>
#include<cstring>
#include<iostream>
#include<algorithm>
#include<ctime>
#include<random>
#include<assert.h>
#define pb emplace_back
#define mp make_pair
#define fi first
#define se second
#define dbg(x) cerr<<"In Line "<< __LINE__<<" the "<<#x<<" = "<<x<<'\n';
#define dpi(x,y) cerr<<"In Line "<<__LINE__<<" the "<<#x<<" = "<<x<<" ; "<<"the "<<#y<<" = "<<y<<'\n';
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int>pii;
typedef pair<ll,int>pli;
typedef pair<ll,ll>pll;
typedef pair<int,ll>pil;
typedef vector<int>vi;
typedef vector<ll>vll;
typedef vector<pii>vpii;
typedef vector<pll>vpll;
template<typename T>T cmax(T &x, T y){return x=x>y?x:y;}
template<typename T>T cmin(T &x, T y){return x=x<y?x:y;}
template<typename T>
T &read(T &r){
	r=0;bool w=0;char ch=getchar();
	while(ch<'0'||ch>'9')w=ch=='-'?1:0,ch=getchar();
	while(ch>='0'&&ch<='9')r=r*10+(ch^48),ch=getchar();
	return r=w?-r:r;
}
template<typename T1,typename... T2>
void read(T1 &x,T2& ...y){read(x);read(y...);}
const int mod=998244353;
inline void cadd(int &x,int y){x=(x+y>=mod)?(x+y-mod):(x+y);}
inline void cdel(int &x,int y){x=(x-y<0)?(x-y+mod):(x-y);}
inline int add(int x,int y){return (x+y>=mod)?(x+y-mod):(x+y);}
inline int del(int x,int y){return (x-y<0)?(x-y+mod):(x-y);}
int qpow(int x,int y){
	int s=1;
	while(y){
		if(y&1)s=1ll*s*x%mod;
		x=1ll*x*x%mod;
		y>>=1;
	}
	return s;
}
const int N=1000010;
mt19937_64 rnd(time(NULL)^(ull)(new char));
ull val[N];
int n,L,R;
int rt[N],tot;
#define ls(x) tree[x].lson
#define rs(x) tree[x].rson
struct Node{
	ull sum;
	int lson,rson;
}tree[N*22];
void modify(int u,int &x,int tl,int tr,int p){
	x=++tot;
	tree[x]=tree[u];
	tree[x].sum^=val[p];
	if(tl==tr)return ;
	int mid=(tl+tr)>>1;
	if(p<=mid)modify(ls(u),ls(x),tl,mid,p);
	else modify(rs(u),rs(x),mid+1,tr,p);
}
int cmp(int x,int y,int tl,int tr){//x>y
	if(tree[x].sum==tree[y].sum)return 0;
	if(tl==tr){
		if(tree[x].sum)return 1;
		return 0;
	}
	int mid=(tl+tr)>>1;
	if(tree[rs(x)].sum==tree[rs(y)].sum)return cmp(ls(x),ls(y),tl,mid);
	return cmp(rs(x),rs(y),mid+1,tr);
}
#undef ls
#undef rs
int q[N],head,tail;
int p[N],a[N];
int ok[N],pre[N];
void solve(){
	read(n,L,R);
	for(int i=1;i<=n;i++)ok[i]=pre[i]=rt[i]=0,val[i]=rnd();
	for(int i=1;i<=n;i++)read(p[i]);
	for(int i=1;i<=n;i++)read(a[i]);
	for(int i=1;i<=tot;i++)tree[i]={0,0,0};
	tot=0;
	modify(rt[0],rt[1],1,n,a[1]);
	ok[1]=1;
	int pos=0;head=1;tail=0;
	for(int i=2;i<=n;i++){
		while(p[i]-p[pos+1]>=L){
			++pos;
			if(ok[pos]){
				while(head<=tail && cmp(rt[pos],rt[q[tail]],1,n))--tail;
				q[++tail]=pos;
			}
		}
		while(head<=tail && p[i]-p[q[head]]>R)++head;
		if(head<=tail){
			ok[i]=1;pre[i]=q[head];
			modify(rt[q[head]],rt[i],1,n,a[i]);
		}
	}
	if(!ok[n])puts("-1");
	else{
		vi vec;int x=n;
		while(x){
			vec.pb(x);x=pre[x];
		}
		cout << vec.size() << '\n';
		sort(vec.begin(),vec.end(),[&](const int &x,const int &y){return a[x]>a[y];});
		for(auto i:vec)cout << a[i] << ' ';
		puts("");
	}
}
signed main(){
	#ifdef do_while_true
//		assert(freopen("data.in","r",stdin));
//		assert(freopen("data.out","w",stdout));
	#endif
	int T;read(T);
	while(T--)solve();
    #ifdef do_while_true
//		cerr<<'\n'<<"Time:"<<1.0*clock()/CLOCKS_PER_SEC*1000<<" ms"<<'\n';
	#endif
	return 0;
}