class Solution
{
    public static void removeLoop(Node head){

        Node fast = head.next;
        Node slow = head;
        while( fast!=slow )
        {
            if( fast==null || fast.next==null )
            return;

            fast = fast.next.next;
            slow = slow.next;
        }
        int size = 1;
        fast = fast.next;
        while( fast!=slow )
        {
            fast = fast.next;
            size+=1;
        }
        slow = head;
        fast = head;

        for(int i=0; i<size-1; i++)
            fast = fast.next;

        while( fast.next != slow )
        {
            fast = fast.next;
            slow = slow.next;
        }
        fast.next = null;
    }
}