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Only Allow Networks that Originate from AS 4 to Enter Router 1

Placing 'ip as-path access-list 1 permit ^111$ on ISP-1 only allows ISP-1 to receive routers from AS111.  

See example from

If you would like for Router 1 to receive only the routes originated from AS 4 (and no Internet routes), you can apply an inbound access list on Router 1:
Quote:ip as-path access-list 1 permit ^4$
router bgp 1
neighbor remote-as 4
neighbor route-map foo in
route-map foo permit 10
match as-path 1
This ensures only networks originated from AS 4 are allowed into Router 1.
Please refer to the explanation of the question. Thank you!