VTMO 2019 — Grade 5 — semifinal Question 19

Fill $1 \text{--} 9$ once each in $a = 3 \times 3$ table. Top row contains $1 , 8 , 6$; bottom row $9 , 4 , 2$. The right column excludes $8 , 3 , 5 , 1 , 9 , 4$; the left excludes $6 , 4 , 3 , 1 , 7 , 2$. What is in the center?