public class SnocList {
    private char c;
    private SnocList l;

    public SnocList(){
    }
    public SnocList (char x, SnocList y) {
        this.c = x;
        this.l = y;
    }
    public char getC(){
        return this.c;
    }
    public SnocList getL(){
        return this.l;
    }
    public void setNext(SnocList input){
        this.l = input;
    }

    public boolean isEmpty() {
        if (this.c == 0) return true;
        return false;
    }
}

public class SnocQueue {
    private SnocList list;

    public SnocQueue(){
        this.list = new SnocList();
    }

    public void enqueue(char c){
        //I don't know what to put here
    }
}

public class Item {
    private int value;
    private Item next;

    public Item(int val) {
        this.value = val;
    }

    public void setNext(Item item) {
        this.next = item;
    }
}

public class SomeQueue {
    private Item head;
    private Item tail;
    private int size;//size is used to verify if it has Items and avoid null references

    public SomeQueue(){
        this.size = 0;
    }
    public void enqueue(Item item) {
        if (this.size > 0) {
            this.tail.setNext(item);
            this.tail = item;
        } else { //this is when the size is 0, it means is empty
            this.head = item;
            this.tail = item;
         }
        this.size++;
    }
}

public class SnocQueue {
 SnocList head;

 public void enqueue(char ch) {
      if(head == null) {
         head = new SnocList(ch, null);
         return;
      } else {
         SnocList curr = head;
         while (curr.l != null) {
             curr = curr.l;
         }
         curr.l = new SnocList(ch, curr.l);
      }
 }
}