#include "bits/stdc++.h"
#define MAXN 100009
#define INF 1000000007
#define mp(x,y) make_pair(x,y)
#define all(v) v.begin(),v.end()
#define pb(x) push_back(x)
#define wr cout<<"----------------"<<endl;
#define ppb() pop_back()
#define tr(ii,c) for(__typeof((c).begin()) ii=(c).begin();ii!=(c).end();ii++)
#define ff first
#define ss second
#define my_little_dodge 46
#define debug(x)  cerr<< #x <<" = "<< x<<endl;
using namespace std;

typedef long long ll;
typedef pair<int,int> PII;
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
int main(){
    //freopen("file.in", "r", stdin);
    int t;
    scanf("%d",&t);
    while(t--){
		int n,m,x;
		scanf("%d",&n);
		int a=0,b=0,c=0;
		for(int i=1;i<=n;i++)
			scanf("%d",&x),c+=x,umax(a,c);
		scanf("%d",&m);c=0;
		for(int i=1;i<=m;i++)
			scanf("%d",&x),c+=x,umax(b,c);
		printf("%d\n",a+b);
    }
	return 0;
}
