<image>(2010 Quanzhou Mock Exam) In recent years, a "Sudoku" logic game has become popular in countries such as those in Europe and America. The rules of the game are as follows:
1. In the 9×9 grid, divided into 9 smaller 3×3 grids, fill the entire grid with the numbers 1, 2, 3,…, 9, with each cell containing exactly one number;
2. Each row, each column, and each smaller 3×3 grid must contain all the numbers 1, 2, 3,…, 9.

Based on the numbers already filled in the right-hand grid, the number that should be filled in place A is ____.