First numbers that belong to both sets:
111,
888,
1111,
8888,
11111,
88888,
111111,
888888,
1111111,
8888888,
11111111,
88888888,
111111111,
888888888,
1111111111,
8888888888,
11111111111,
88888888888,
111111111111,
888888888888,
1111111111111,
8888888888888,
11111111111111,
88888888888888,
111111111111111,
888888888888888.