sdf

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Queue<Integer> qint = new LinkedList<Integer>(); //// ta3rifkrdny queue bo integer
        Queue<String> qstring = new LinkedList<String>();//// ta3rifkrdny queue bo string

        /// tekrdny data bo queue
        qint.add(1);
        qint.add(2);
        qstring.add("a");
        qstring.add("b");

        /// serkrdny yakam datay naw queue
        System.out.println(qint.peek());
        System.out.println(qstring.peek());

        /// zanini qabaray naw queue
        System.out.println(qint.size());
        System.out.println(qstring.size());

        /// check krdn boy bzanin queue batala yan na
        System.out.println(qint.isEmpty());
        System.out.println(qstring.isEmpty());

        /// darkrdny data la queue
        System.out.println(qint.remove());
        System.out.println(qstring.remove());

        /// pechawana krdnaway datay naw queue ba stack
        /// yan chonety bakar henany stack w queue pekawa
        Queue<Integer> q = new LinkedList<Integer>();
        Stack<Integer> s = new Stack<Integer>();

        q.add(1);
        q.add(2);
        q.add(3);
        q.add(4);

        while (!q.isEmpty()) { //// sarata zhmarakan axayna naw stack
            s.push(q.remove());
        }
        while (!s.isEmpty()) { /// dway ayxaynawa naw queue ama wa akat pechawana betawa
            q.add(s.pop());
        }
        System.out.println(q);

    }
}