diff --git a/hamming.php b/hamming.php
index b457e65..198eed1 100644
--- a/hamming.php
+++ b/hamming.php
@@ -5,9 +5,16 @@
 // convenience to get you started writing code faster.
 //
 
-function distance($a, $b)
-{
-    //
-    // YOUR CODE GOES HERE
-    //
+function hamdist($x, $y){
+  for($dist = 0, $val = $x ^ $y; $val; ++$dist){ 
+      $val &= $val - 1;
+  }
+  return $dist;
 }
+
+function hamdist_str($x, $y){
+    return hamdist(bindec($x), bindec($y));
+}
+
+
+echo hamdist_str('GAGCCTACTAACGGGAT,CATCGTAATGACGGCCT');