Day 3 and 4 solutions.

day4.py

@@ -0,0 +1,15 @@
+import sys
+import md5
+
+word = sys.argv[1]
+number = 0
+
+while True:
+    digester = md5.new(word)
+    digester.update(str(number))
+
+    if digester.hexdigest()[0:6] == "000000":
+        print word, number
+        break
+
+    number = number + 1