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.
6    4    3    
  1    3    8  
    3    8    2
3    1    9    
  9    2    7  
    4    7    3
9    6    5    
  5    4    6  
    6    1    4
* Easy