void main(){
Queue<int> q1,q2;
Stack<int> s;
int n;
cin>>n;
for(int i=0;i<n;i++){
int x;
cin>>x;
q1.enqueue(x);
}
while(!q1.isEmpty()){
int x=q1.dequeue();
q2.enqueue(x);
s.push(x);
}
while(!q2.isEmpty()){
int x=q2.dequeue();
cout<<x<<" ";
}
cout<<endl;
while(!s.isEmpty()){
int x=s.pop();
cout<<x<<" ";
}
cout<<endl;
}