First numbers that belong to both sets:
999,
7777,
9999,
22222,
99999,
999999,
4444444,
9999999,
88888888,
99999999,
999999999,
1111111111,
9999999999,
55555555555,
99999999999,
999999999999,
7777777777777,
9999999999999,
22222222222222,
99999999999999,
999999999999999.