SUDOKU

Write a number from 1 to 9 into each empty square in the grid so that every number from 1 to 9 appears exactly once in each horizontal row, each vertical column, and each 3×3 block.
      2    5    
  4    8    9  
    5    6    2
5          2    
  7    9    6  
    8    3    4
8    9    6    
  2    4        
    1    5    9
* Easy