class Solution {
    public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
        ListNode head = new ListNode();
        ListNode temp=head;
        
        while(l1!=null&&l2!=null){
            if(l1.val>=l2.val){
                temp.next=l2;
                l2=l2.next;
            }
            else{
                temp.next=l1;
                l1=l1.next;
            }
            temp=temp.next;
        }
        
        temp.next=(l1==null)?l2:l1;
        
        return head.next;
    }
}