#include <bits/stdc++.h>

using namespace std;

int t;

string p;

int n;

string str;

deque<int> dq;

bool err;

int main()

{

ios::sync_with_stdio(0);

cin.tie(0);

cin >> t;

while (t--) {

err = false;

bool rev = false;

cin >> p;

cin >> n;

cin >> str;

string temp;

for (int i = 0; i < str.size(); i++) {

if (str[i] == ',' || str[i] == ']') {

if (temp != ""){

dq.push_back(stoi(temp));

temp = "";

}

}

else if (isdigit(str[i])) {

temp += str[i];

}

}

for (int i = 0; i < p.size(); i++) {

if (p[i] == 'R') {

rev = rev ? false : true;

}

else {

if (dq.empty()) {

cout << "error\n";

err = true;

break;

}

if (!rev)

dq.pop_front();

else

dq.pop_back();

}

}

if (!err) {

cout << "[";

if (!rev) {

for (int i = 0; i < dq.size(); i++){

cout << dq[i];

if (i < dq.size() - 1) cout << ",";

}

}

else {

for (int i = dq.size() - 1; i >= 0; i--){

cout << dq[i];

if (i > 0) cout << ",";

}

}

cout << "]\n" ;

}

dq.clear();

}

return 0;

}