-- Database schema
| users : userid [ INTEGER ] primary_key , age [ TEXT ] , u_gender [ TEXT ] , occupation [ TEXT ] | directors : directorid [ INTEGER ] primary_key , d_quality [ INTEGER ] , avg_revenue [ INTEGER ] | actors : actorid [ INTEGER ] primary_key , a_gender [ TEXT ] , a_quality [ INTEGER ] | movies : movieid [ INTEGER ] primary_key , year [ INTEGER ] , isEnglish [ TEXT ] , country [ TEXT ] , runningtime [ INTEGER ] | movies2actors : movieid [ INTEGER ] , actorid [ INTEGER ] , cast_num [ INTEGER ] | movies2directors : movieid [ INTEGER ] , directorid [ INTEGER ] , genre [ TEXT ] | u2base : userid [ INTEGER ] , movieid [ INTEGER ] , rating [ TEXT ] |
-- -- Please list the actor IDs whose movies have the newest published date.

SELECT T1.actorid FROM movies2actors AS T1 INNER JOIN movies AS T2 ON T1.movieid = T2.movieid WHERE T2.year = 4;