#include #include #include #include #include #include #include #include #include #include #include #include using namespace std; using ll = long long; void solve(){ int N, M; string S, T=""; cin >> N >> S; reverse(S.begin(), S.end()); for (int i=0; i 2 && T[M-1] == 'A' && T[M-2] == 'B' && T[M-3] == 'B'){ T.pop_back(); T.pop_back(); } } reverse(T.begin(), T.end()); cout << T << endl; } int main(){ int T; cin >> T; while(T){ T--; solve(); } return 0; }