Code:
#!C:/Python27/python.exe
import cgi
form = cgi.FieldStorage()
a=int(form.getvalue('a','0'),0)
b=int(form.getvalue('b','0'),0)
print """Content-type: text/html
<html>
<head>
<title>Greeting Page</title>
</head>
<b><h1>Welcome!</h1></b>
<body>