First numbers that belong to both sets:
12,
21,
34,
45,
56,
76,
432,
656,
765,
987,
1234,
2121,
5434,
5676,
7878,
10101,
12345,
21012,
34323,
43434,
43454,
54321,
65654,
78789,
89898,
98987,
121010,
123234,
232123,
232345,
234321,
321012,
321212,
345456,
345676,
454545,
456565,
456765,
543210,
565656,
567656,
656787,
676767,
676789,
678765,
765654,
876765,
876789,
987678,
989898,
1012345,
1232345,
1234321,
1234545,
2101210,
3212121,
3456787,
4321234,
4545456,
5454321,
5454345,
5456787,
6543454,
6567876,
6765432,
6765678,
7654343,
7676565,
7676787,
8767676,
8787678,
8789898,
8987656,
10101212,
12101232,
12321234,
12343210,
21012321,
21234567,
23232123,
23232321,
23234343,
23432323,
23434567,
32123454,
34323210,
34323234,
34545432,
43212345,
43234567,
45432345,
45454545,
45456789,
45656567,
45656767,
45676545,
54321212,
54323456,
54343456,
54543234,
54567876,
56567878,
56765456,
56767878,
56789898,
65454345,
65454543,
65654343,
65654567,
65676765,
67654321,
67654545,
76787678,
78767654,
78767898,
78787656,
87654343,
87656765,
87676767,
87878767,
98765676,
98767878.