First numbers that belong to both sets:
12,
56,
232,
876,
1212,
3456,
9876,
12321,
43456,
45432,
65432,
87656,
87876,
321012,
323232,
323432,
343432,
345656,
543456,
545656,
567656,
765432,
765656,
767656,
789876,
987656,
2101212,
2123232,
2323212,
2323432,
2343456,
2345432,
2345656,
4323456,
4543212,
4545432,
4545656,
6543232,
6543456,
6545676,
6565432,
6567656,
6767676,
6787656,
8765676,
8787876,
8987676,
10101012,
10123456,
12323232,
12323456,
12345656,
32123232,
32323432,
32343456,
34343232,
34543232,
34565656,
34565676,
54321012,
54323232,
54543232,
54545432,
54545676,
56543232,
56545432,
56567656,
56765432,
56787876,
76765432,
76767876,
78765656,
98767656,
98987656,
212121012,
212123232,
212323456,
212343456,
212345676,
232321212,
232323456,
234345656,
234543232,
234543456,
234545656,
234545676,
234565432,
234567656,
432121212,
432321012,
432323232,
432323432,
432323456,
432343432,
434343456,
434345656,
434345676,
434543232,
434567656,
434567676,
454321212,
454343232,
454343432,
454543232,
454545656,
454565432,
454565676,
456543456,
654323232,
654543232,
654543456,
654545432,
654567656,
654567876,
656565656,
656567676,
676565432,
676765656,
676767876,
678765656,
678767676,
876543456,
878787656,
898767876,
898787676,
898989876.