# the fillA function has to be defined here before it is called from the main function
def fillA(j, k):
	print "  now we are executing function fillA"
	global a     # this declares variable a as a global variable

	total = 0
     	while j < k:
		a.append(j)
		total = total + a[j]
		j = j + 1
	print " "
	return total


# the printA function has to be defined here before it is called from the main function
def printA(j, k):
	print "  now we are executing function printA"
	global a   # declare as global variable defined in main

     	while j < k:
		print "   ..." + str(a[j])
		j = j + 1
	print " "



# Here is the main function
# The main can call other functions that have been previously defined
# the variable a[] can be used in the other functions.
#   The other functions must declare it to be a global variable

a = []		# define list a
print "Starting from main"
print " "

start = 0
end = 10

t = fillA(start, end)
print "Back in main"
print " fillA returned the value:  " + str(t)
print " "

printA(start, end)
print "Back to main"