class ListNode {
      int val;
      ListNode next;
      ListNode(int x) { this.next=null;this.val = x; }
      public String toString(){
              return (Integer.toString(val));

      }
  }


class Solution {
    public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
        ListNode head=null, tmp;
        int c=0;
        while(l1!=null && l2!=null){
            tmp=new ListNode((int)((l1.val+l2.val+c)%10));
            c=(int)((l1.val+l2.val+c)/10);
            if(head==null){head=tmp;}
            tmp=tmp.next;
            l1=l1.next;
            l2=l2.next;
        }
/*        if(l1==null && l2!=null){
           while(l2!=null){
               tmp=new ListNode(0);
               tmp.val=(int)((l2.val+c)/10);
               c=(int)((l2.val+c)%10);
               tmp=tmp.next;
               l2=l2.next;
           }
        }
       else{
           if(l1!=null && l2==null){
             while(l1!=null){
               tmp=new ListNode(0);
               tmp.val=(int)((l1.val+c)/10);
               rem=(int)((l1.val+c)%10);
               tmp=tmp.next;
               l1=l1.next;
             }
            }
        }*/
       if (c!=0){
           tmp=new ListNode(c);
           }
        return head;
    }
}