diff --git a/src/main/java/Solution.java b/src/main/java/Solution.java
index 5615be4..2311c7b 100644
--- a/src/main/java/Solution.java
+++ b/src/main/java/Solution.java
@@ -1,6 +1,4 @@
 import java.util.*;
-import java.io.*;
-import java.math.*;
 
 /**
  * Template code to help you parse the standard input 
@@ -10,11 +8,64 @@ class Solution {
 	
 	public static void main( String[] args ) {
 		Scanner in = new Scanner( System.in );
-		// read values with in.next...() methods
 		
-		// code your solution here
+		int[][] grid = new int[9][9];
+		for ( int index = 0; in.hasNext(); index++ ) {
+			int row = index / 9;
+			int col = index % 9;
+			grid[row][col] = in.nextShort();
+		}
 		
-		// Write result with System.out.println()
-		System.out.println( "value" );
+		System.out.println( checkHorizontally( grid )
+		                    && checkVertically( grid )
+		                    && checkAllBlocks( grid )
+		);
 	}
+	
+	private static boolean checkHorizontally( int[][] grid ) {
+		//noinspection ForLoopReplaceableByForEach
+		for ( int r = 0; r < grid.length; r++ ) {
+			BitSet bs = new BitSet( 9 );
+			for ( int c = 0; c < grid[r].length; c++ ) {
+				bs.set( grid[r][c] );
+			}
+			if ( bs.cardinality() != 9 ) return false;
+		}
+		return true;
+	}
+	
+	private static boolean checkVertically( int[][] grid ) {
+		for ( int c = 0; c < 9; c++ ) {
+			BitSet bs = new BitSet( 9 );
+			//noinspection ForLoopReplaceableByForEach
+			for ( int r = 0; r < grid.length; r++ ) {
+				bs.set( grid[r][c] );
+			}
+			if ( bs.cardinality() != 9 ) return false;
+		}
+		return true;
+	}
+	
+	private static boolean checkAllBlocks( int[][] grid ) {
+		return checkBlock( grid, 0, 0 )
+		       && checkBlock( grid, 0, 3 )
+		       && checkBlock( grid, 0, 6 )
+		       && checkBlock( grid, 3, 0 )
+		       && checkBlock( grid, 3, 3 )
+		       && checkBlock( grid, 3, 6 )
+		       && checkBlock( grid, 6, 0 )
+		       && checkBlock( grid, 6, 3 )
+		       && checkBlock( grid, 6, 6 );
+	}
+	
+	private static boolean checkBlock( int[][] block, int indexTop, int indexLeft ) {
+		BitSet bs = new BitSet( 9 );
+		for ( int r = indexTop; r < indexTop + 3; r++ ) {
+			for ( int c = indexLeft; c < indexLeft + 3; c++ ) {
+				bs.set( block[r][c] );
+			}
+		}
+		return ( bs.cardinality() == 9 );
+	}
+	
 }