#include <bits/stdc++.h>
using namespace std;
signed main(){
ios::sync_with_stdio(0);
cin.tie(0);
int n;
cin >> n;
array<int,2> a[n];
int sum = 0;
for(int i = 0;i<n;i++){
cin >> a[i][0];
sum+=a[i][0];
a[i][1]=i;
}
int m;
cin >> m;
int b[m];
for(int &i : b){
cin >> i;
}
assert(m==1);
vector<vector<int>>v;
while(sum>0){
sort(a,a+n);
v.push_back({});
for(int i = n-1;i>=n-b[0];i--){
v.back().push_back(a[i][1]);
a[i][0]--;
}
sum-=b[0];
}
for(int i = 0;i<n;i++){
if(a[i][0]!=0){
cout << -1;
return 0;
}
}
cout << v.size() << "\n";
for(vector<int>x : v){
cout << x.size() << " ";
for(int i : x){
cout << i+1 << " ";
}
cout << "\n";
}
return 0;
}
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