#include <bits/stdc++.h>
using namespace std;
int main(){
ios::sync_with_stdio(0);
cin.tie(0);
int n,m;
cin >> n;
int arr[n];
bool st1=true;
for(int i=0; i<n; i++){
cin >> arr[i];
if(arr[i]!=1) st1=false;
}
cin >> m;
vector<int> brr(m);
for(int i=0; i<m; i++) cin >> brr[i];
if(st1){
for(int i=0; i<n; i++){
for(int j=0; j<m; j++) brr.push_back(brr[j]);
}
m=brr.size();
bitset<505> bs[m+1];
bs[0][0]=1;
for(int i=0; i<m; i++){
bs[i+1]=bs[i]|(bs[i]<<brr[i]);
}
if(!bs[m][n]){
cout << -1;
return 0;
}
else{
vector<int> ans;
int cur=n;
for(int i=m; i>0; i--){
if(bs[i-1][cur]) continue;
cur-=brr[i-1];
ans.push_back(brr[i-1]);
}
cout << ans.size() << '\n';
cur=1;
for(int i:ans){
cout << i << ' ';
for(int j=0; j<i; j++){
cout << cur << ' ';
cur++;
}
cout << '\n';
}
}
}
}
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