Next palindrome

	A	B	C	D	E	F	G	H	I	J	K
1	test vectors	expected result	solution in one formula	solution with helper columns	left	left + 1	reverse left + 1	reverse left	middle	right	https://www.reddit.com/r/dailyprogrammer/comments/n3var6/20210503_challenge_388_intermediate_next/gwxopri/?context=3

2	999	1001	1001	1001	9	10	01	9	9	9
3	998	999	999	999	9	10	01	9	9	8
4	99998	99999	99999	99999	99	100	001	99	9	98
5	999998	999999	999999	999999	999	1000	0001	999		998
6	1034895	1035301	1035301	1035301	103	104	401	301	4	895
7	10348953	10355301	10355301	10355301	1034	1035	5301	4301		8953
8	35984301	35988953	35988953	35988953	3598	3599	9953	8953		4301
9	359854301	359858953	359858953	359858953	3598	3599	9953	8953	5	4301
10	192	202	202	202	1	2	2	1	9	2
11	808	818	818	818	8	9	9	8	0	8
12	898	909	909	909	8	9	9	8	9	8
13	2133	2222	2222	2222	21	22	22	12		33
14	4052555153018976267	4052555153515552504	4052555153515552504	4052555153515552504	405255515	405255516	615552504	515552504	3	018976267
15	123000	123321	123321	123321	123	124	421	321		000
16	1234000	1234321	1234321	1234321	123	124	421	321	4	000
17	129	131	131	131	1	2	2	1	2	9
18	190	191	191	191	1	2	2	1	9	0
19	192	202	202	202	1	2	2	1	9	2
20	199	202	202	202	1	2	2	1	9	9
21	200	202	202	202	2	3	3	2	0	0
22	202	212	212	212	2	3	3	2	0	2
23	9	11	11	11					9
24	128	131	131	131	1	2	2	1	2	8
25	129	131	131	131	1	2	2	1	2	9
26	130	131	131	131	1	2	2	1	3	0
27	131	141	141	141	1	2	2	1	3	1
28	132	141	141	141	1	2	2	1	3	2
29	141	151	151	151	1	2	2	1	4	1
30	90	99	99	99	9	10	01	9		0
31	909	919	919	919	9	10	01	9	0	9
32	989	999	999	999	9	10	01	9	8	9
33
34
35
36
37
38
39
40