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.
  7        81  
38          95
        1      7
      3  7      
    6  5  9    
      2          
8      6      2
61            9
  95      78  
**** Very hard