public static bool targil1(int x, Stack<int> sta)
        {
            Stack<int> sta2 = new Stack<int>();
            string st1 = "";
            string st2 = "";
            while (sta.IsEmpty() != true)
            {
                st1 =st1+ sta.Top();
                sta2.Push(sta.Pop());
            }
            while (sta2.IsEmpty() != true)
            {
                st2 = st2 + sta.Top();
                sta.Push(sta2.Pop());
            }
            if (st1.IndexOf(x.ToString()) != -1 || st2.IndexOf(x.ToString()) != -1)
                return true;
            else
                return false;
        
        }

public static List<int> targil2(List<int> l1, List<int> l2)
        {
            string st = "";
            string st2 = "";
            int count = 0;
            Node<int> pos = l2.GetFirst();
            Node<int> pos2 = l1.GetFirst();
            while (pos2 != null)
            {
                st = st + pos2.GetInfo();
                pos2 = pos2.GetNext();
            }
            while (pos != null)
            {
                count++;
                st2 = st2 + pos.GetInfo();
                pos = pos.GetNext();
            }
            int start = st.IndexOf(st2);
            st = st.Remove(start, count);
            l1 = new List<int>();
            pos=null;
            for (int i = 0; i < st.Length; i++)
            {
                pos = l1.Insert(pos, (int)st[i]);
            }
            return l1;
           
        }