#include<bits/stdc++.h>
using namespace std;
int main()
{
     long int n,m;
    cin>>n;
    while(n!=0)
    {
   long int a[n],suma[n],sum=0;
    sum=0;

    for(int i=0;i<n;i++){
        cin>>a[i];
        sum+=a[i];
        suma[i]=sum;
    }
    cin>>m;
    long int b[m],sumb[m];
    sum=0;
    for(int i=0;i<m;i++){
        cin>>b[i];
        sum+=b[i];
        sumb[i]=sum;
    }
   long long ans=0,ab=0,ac=0,y=0,x;
    for(int i=0;i<n;i++)
    {

    int low=0,high=n,mid,x=-1,val=a[i];
    while(low<high)
    {
        mid=(low+high)/2;
        if(b[mid]==val)
            {
                x=mid;
                break;
            }
        else if(b[mid]>val)
        {
            high=mid-1;

        }
        else
            low=mid+1;
    }
       ;
        if(x>=0)
        {
          if(y>=1)
          {
          ans+=max(suma[i]-suma[ab],sumb[x]-sumb[ac]);
          }
          else
          {
             ans+=max(suma[i],sumb[x]);
          }

          y++;
          ab=i;
          ac=x;
        }
        //cout<<ans<<endl;
        //cout<<ans<<endl;

    }
    if((ab<n||ac<m)&&y)
    {
        ans+=max(suma[n-1]-suma[ab],sumb[m-1]-sumb[ac]);
    }
    else
    {
        ans+=max(suma[n-1],sumb[m-1]);
    }
  cout<<ans<<endl;
  cin>>n;
    }
return 0;
}