答案 `

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
int money[50100];
int main(){
    int t;
    cin >>t;
    for (int i = 0;i<t;i++){
        int n;
        string l;
        cin >>n>>l;
        int wg = 0;
        int rmb = 0;
        for (int j = 0;;j++){
            if (wg >= n - 1){
                money[i] = rmb;
                break;
            }
            if(l[wg + 1] == '.'){
                if (wg + 1 >= n){
                    money[i] = rmb;
                    break;
                }
                wg++;
            }
            if(l[wg + 1] == '@'){
                if (wg + 1 >= n){
                    money[i] = rmb;
                    break;
                }
                wg++;
                rmb++;
            }
            else if(l[wg + 1] == '*' && wg + 2 >= l.size()){
                money[i] = rmb;
                break;
            }
            else if(l[wg + 1] == '*' && l[wg + 2] == '.'){
                if (wg + 2 >= n){
                    money[i] = rmb;
                    break;
                }
                wg += 2;
            }
            else if(l[wg + 1] == '*' && l[wg + 2] == '@'){
                if (wg + 2 >= n){
                    money[i] = rmb;
                    break;
                }
                wg += 2;
                rmb++;
            }
            else if(l[wg + 1] == '*' && l[wg + 2] == '*'){
                money[i] = rmb;
                break;
            }
        }
    }
    for (int i = 0;i<t;i++){
        cout <<money[i]<<endl;
    }
}