The purpose of the following Python program is to ______________________

c = open("c", 'w')

r = input("--> ")

while r != 'n':

a = input("N: ")

n = input("C: ")

b = input("B: ")

c.write(a+": "+n+": "+b+" ")

r = input("--> ")

c.close()

		keep swapping a, n and c until they are in the correct order
		read keyboard input which is then written as records to file until the user says 'n'.
		read data from a file
		process a list sequence