class ListNode:
    def __init__(self, val = 0, next = None):
        self.val = val
        self.next = next
class Solution:
    def reverseBetween(self, head: Optional[ListNode], left: int, right: int) -> Optional[ListNode]:
        cnt = 0
        l = []
        true_head = ListNode()
        true_head.next = head
        true_end = ListNode()
        cur = head
        while cur.next != None:
            cur = cur.next
        cur.next = true_end
        cur = true_head

        while cur != None:
            if cnt >= left - 1 and cnt <= right + 1:
                l.append(cur)
            cur = cur.next
            cnt += 1
        for ind in range(len(l), 0, -1):
            l[ind].next = l[ind-1]