class MyQueue {
public:
    stack<int> IN;
    stack<int> OUT;
    MyQueue() {

    }
    
    void push(int x) {
        IN.push(x);
    }
    
    int pop() {
        if(OUT.empty()){
            while(!IN.empty()){
                OUT.push(IN.top());
                IN.pop();
            }
        }
        int res=OUT.top();
        OUT.pop();
        return res;
    }
    
    int peek() {
        int res =this->pop();
        OUT.push(res);
        return res;
    }
    
    bool empty() {
        return IN.empty()&&OUT.empty();
    }
};

/**
 * Your MyQueue object will be instantiated and called as such:
 * MyQueue* obj = new MyQueue();
 * obj->push(x);
 * int param_2 = obj->pop();
 * int param_3 = obj->peek();
 * bool param_4 = obj->empty();
 */

class MyStack {
public:
    queue<int> que;
    MyStack() {

    }
    
    void push(int x) {
        que.push(x);
    }
    
    int pop() {
        int size=que.size();
        size --;
        while(size--){
            que.push(que.front());
            que.pop();
        }
        int res= que.front();
        que.pop();
        
        return res;
    }
    
    int top() {
        return que.back();
    }
    
    bool empty() {
        return que.empty();
    }
};

/**
 * Your MyStack object will be instantiated and called as such:
 * MyStack* obj = new MyStack();
 * obj->push(x);
 * int param_2 = obj->pop();
 * int param_3 = obj->top();
 * bool param_4 = obj->empty();
 */