#include <bits/stdc++.h>
using namespace std;
#include <boost/multiprecision/cpp_int.hpp>
typedef boost::multiprecision::cpp_int mp;


int main(){
    mp N,Q;
    cin>>N;
    vector<int> atlas(60,-1);
    for(int i=0;i<N;i++){
        mp A;
        cin>>A;
        for(int j=0;j<60;++j){
            mp T=A%2;
            if(T==1){
                atlas[j]=i;
            }
            A>>=1;
        }
    }
    cin>>Q;
    for(int i=0;i<Q;++i){
        mp count=0,dec=0;
        map<int,mp> m;
        mp b;
        cin>>b;
        mp odd=-1;
        for(int j=0;j<60;++j){
            mp target=b%2;
            if(atlas[j]==-1){
                if(odd!=-1 && odd!=target){
                    cout<<-1<<endl;
                    goto end;
                }else{
                    odd=target;
                }
            }else{
                if(m.count(atlas[j]) && m[atlas[j]]!=target){
                    cout<<-1<<endl;
                    goto end;
                }else if(!m.count(atlas[j])){
                    ++dec;
                    count+=1-target;
                    m[atlas[j]]=target;
                }
            }
            b>>=1;
        }
        if((count+odd)%2){
            cout<<((dec==N)?(mp)-1:count+1)<<endl;
        }else{
            cout<<count<<endl;
        }
        end:{}
    }

}