View Compilation Error

0_0_39304391_16835.cpp: In function 'int main()':
0_0_39304391_16835.cpp:3:219: error: 's' was not declared in this scope
    3 | using namespace std;queue<int>a;int main(){int t,n,k;cin>>t;while(t--){cin>>n;while(a.size()>3){a.push(a.front());a.pop();a.pop();if(a.size()<=3)break;a.push(a.front());a.pop();a.push(a.front());a.pop();a.pop();}while(s.size()){cout<<a.front()<<" ";a.pop();}cout<<endl;}}
      |                                                                                                                                                                                                                           ^