First numbers that belong to both sets:
11,
22,
33,
44,
55,
66,
77,
88,
99,
111,
222,
333,
444,
555,
666,
777,
888,
999,
1100,
1111,
2200,
2211,
2222,
3300,
3311,
3322,
3333,
4400,
4411,
4422,
4433,
4444,
5500,
5511,
5522,
5533,
5544,
5555,
6600,
6611,
6622,
6633,
6644,
6655,
6666,
7700,
7711,
7722,
7733,
7744,
7755,
7766,
7777,
8800,
8811,
8822,
8833,
8844,
8855,
8866,
8877,
8888,
9900,
9911,
9922,
9933,
9944,
9955,
9966,
9977,
9988,
9999,
11000,
11100,
11111,
22000,
22111,
22200,
22211,
22222,
33000,
33111,
33222,
33300,
33311,
33322,
33333,
44000,
44111,
44222,
44333,
44400,
44411,
44422,
44433,
44444,
55000,
55111,
55222,
55333,
55444,
55500,
55511,
55522,
55533,
55544,
55555,
66000,
66111,
66222,
66333,
66444,
66555,
66600,
66611,
66622,
66633,
66644,
66655,
66666,
77000,
77111,
77222,
77333,
77444,
77555,
77666,
77700,
77711,
77722,
77733,
77744,
77755,
77766,
77777,
88000,
88111,
88222,
88333,
88444,
88555,
88666,
88777,
88800,
88811,
88822,
88833,
88844,
88855,
88866,
88877,
88888,
99000,
99111,
99222,
99333,
99444,
99555,
99666,
99777,
99888,
99900,
99911,
99922,
99933,
99944,
99955,
99966,
99977,
99988,
99999,
110000,
111000,
111100,
111111,
220000,
221100,
221111,
222000,
222111,
222200,
222211,
222222,
330000,
331100,
331111,
332200,
332211,
332222,
333000,
333111,
333222,
333300,
333311,
333322,
333333,
440000,
441100,
441111,
442200,
442211,
442222,
443300,
443311,
443322,
443333,
444000,
444111,
444222,
444333,
444400,
444411,
444422,
444433,
444444,
550000,
551100,
551111,
552200,
552211,
552222,
553300,
553311,
553322,
553333,
554400,
554411,
554422,
554433,
554444,
555000,
555111,
555222,
555333,
555444,
555500,
555511,
555522,
555533,
555544,
555555,
660000,
661100,
661111,
662200,
662211,
662222,
663300,
663311,
663322,
663333,
664400,
664411,
664422,
664433,
664444,
665500,
665511,
665522,
665533,
665544,
665555,
666000,
666111,
666222,
666333,
666444,
666555,
666600,
666611,
666622,
666633,
666644,
666655,
666666,
770000,
771100,
771111,
772200,
772211.
Some larger examples :
999999999998888,
999999999999000,
999999999999111,
999999999999222,
999999999999333,
999999999999444,
999999999999555,
999999999999666,
999999999999777,
999999999999888,
999999999999900,
999999999999911,
999999999999922,
999999999999933,
999999999999944,
999999999999955,
999999999999966,
999999999999977,
999999999999988,
999999999999999.