#include <bits/stdc++.h>
using namespace std;
int main() {
// your code goes here
int t=1;
cin>>t;
while(t--){
//int n;
//cin>>n;
string a,b,order;
int na,nb;
cin>>na>>a>>nb>>b>>order;
for(int i=0;i<nb;i++){
if(order[i] == 'D') a = a + b[i];
else a = b[i] + a;
}
cout<<a<<"\n";
}
return 0;
}
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