#include<bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define maxn 1000005
#define put() putchar('\n')
#define Tp template<typename Ty>
#define Ts template<typename Ty,typename... Ar>
using namespace std;
void read(int &x){
    int f=1;x=0;char c=getchar();
    while (c<'0'||c>'9') {if (c=='-') f=-1;c=getchar();}
    while (c>='0'&&c<='9') {x=x*10+c-'0';c=getchar();}
    x*=f;
}
namespace Debug{
	Tp void _debug(char* f,Ty t){cerr<<f<<'='<<t<<endl;}
	Ts void _debug(char* f,Ty x,Ar... y){while(*f!=',') cerr<<*f++;cerr<<'='<<x<<",";_debug(f+1,y...);}
	Tp ostream& operator<<(ostream& os,vector<Ty>& V){os<<"[";for(auto& vv:V) os<<vv<<",";os<<"]";return os;}
	#define gdb(...) _debug((char*)#__VA_ARGS__,__VA_ARGS__)
}using namespace Debug;
#define fi first
#define se second
#define mk make_pair
const int mod=1e9+7;
int power(int x,int y=mod-2) {
	int sum=1;
	while (y) {
		if (y&1) sum=sum*x%mod;
		x=x*x%mod;y>>=1;
	}
	return sum;
}
mt19937 rnd(time(0));
int n,L,R;
int q[maxn],head,tail;
int a[maxn],c[maxn];
unsigned val[maxn];
int root[maxn],cnt,fl[maxn];
struct yyy{
	int ls,rs,siz;
	ll sum;
}f[maxn*20];
int Update(int l,int r,int pre,int k) {
	int rt=++cnt;f[rt]=f[pre];
	if (l==r) return f[rt].siz++,f[rt].sum+=val[k],rt;
	int mid=l+r>>1;
	if (k<=mid) f[rt].ls=Update(l,mid,f[rt].ls,k);
	else f[rt].rs=Update(mid+1,r,f[rt].rs,k);
	f[rt].sum=f[f[rt].ls].sum^f[f[rt].rs].sum;
	f[rt].siz=f[f[rt].ls].siz+f[f[rt].rs].siz;
	return rt;
}
bool find(int l,int r,int rt1,int rt2) {
	if (l==r) return f[rt1].siz>f[rt2].siz;
	int mid=l+r>>1;
	if (f[f[rt1].rs].sum==f[f[rt2].rs].sum) return find(l,mid,f[rt1].ls,f[rt2].ls);
	else return find(mid+1,r,f[rt1].rs,f[rt2].rs);
}
int Query(int l,int r,int rt,int k) {
	if (!f[rt].siz) return 0;
	if (l==r) return l;
	int mid=l+r>>1;
	if (r<=k) {
		if (f[f[rt].rs].siz) return Query(mid+1,r,f[rt].rs,k);
		else return Query(l,mid,f[rt].ls,k);
	}
	int tmp1=0,tmp2=0;
	if (mid<k) tmp1=Query(mid+1,r,f[rt].rs,k);
	if (tmp1) return tmp1;
	tmp2=Query(l,mid,f[rt].ls,k);
	return tmp2;
}
bool cmp(int x,int y) {
	return find(1,n,root[x],root[y]);
//	int id=find(1,n,root[x],root[y]);
//	int tmp1=Query(1,n,root[x],id);
//	int tmp2=Query(1,n,root[y],id);
//	return tmp1>tmp2;
}
void print(int l,int r,int rt) {
//	gdb(l,r,f[f[rt].ls].siz,f[f[rt].rs].siz);
	if (l==r) {
		for (int i=1;i<=f[rt].siz;i++) printf("%d ",l);
		return ;
	}
	int mid=l+r>>1;
	if (f[f[rt].rs].siz) print(mid+1,r,f[rt].rs);
	if (f[f[rt].ls].siz) print(l,mid,f[rt].ls);
}
int T;
void solve(int Cas) {
	int i,j,las=0;
	read(n);read(L);read(R);
	
	for (i=1;i<=n;i++) root[i]=fl[i]=0;cnt=0;
	for (i=1;i<=n;i++) read(c[i]);
	for (i=1;i<=n;i++) read(a[i]);
//	if (Cas==2&&T>=3) {
//		printf("%d %d %d\n",n,L,R);
//		for (i=1;i<=n;i++) printf("%d ",c[i]);put();
//		exit(0);
//	} 
	for (i=1;i<=n;i++) val[i]=rnd();
	root[1]=Update(1,n,root[1],a[1]);fl[1]=1;
	head=1;tail=0;
	las=0;
	for (i=2;i<=n;i++) {
		int ls=lower_bound(c+1,c+1+n,c[i]-R)-c;
		int rs=lower_bound(c+1,c+1+n,c[i]-L+1)-c-1;
		if (ls>rs) continue;
		for (j=las+1;j<=rs;j++) {
			while (head<=tail&&cmp(q[tail],j)==0) tail--;
			q[++tail]=j; 
		}
		las=rs;
		while (head<=tail&&q[head]<ls) head++;
		if (head<=tail) {
//			gdb(i,head,tail,q[head],q[tail]);
//			assert(ls<=q[head]);
//			assert(q[head]<=rs);
			root[i]=Update(1,n,root[q[head]],a[i]);
			fl[i]=1;			
		}
	}
	if (fl[n]) printf("%d\n",f[root[n]].siz),print(1,n,root[n]),put();
	else puts("-1");
}
signed main(void){
	read(T);
	for (int i=1;i<=T;i++) solve(i);
//	while (T--) solve();
	return 0;
}