#!/Library/Frameworks/Python.framework/Versions/Current/bin/python
# L-21 MCS 275 Mon 1 Mar 2010 : web_gcd.py
import cgi
form = cgi.FieldStorage()
print "Content-Type: text/plain\n"
try:
   x = form['A'].value
   print "your first number is " + x
except KeyError:
   print "please enter a first number"
try:
   y = form['B'].value
   print "your second number is " + y
except KeyError:
   print "please enter a second number"

def gcd(a,b):    # the code from Lecture 1 !
   r = a % b
   if r == 0:
      return b
   else:
      return gcd(b,r)

ix = int(x)
iy = int(y)
print "gcd(%d,%d) = %d" % (ix,iy,gcd(ix,iy))