################################################################
# PROGRAM Remove Everything Except "a"
################################################################

TheString1 = "The rain in Spain lies mainly in the plain"

NewString1 = ""
TheKeepList1 = {'a'}

for EachLetter1 in TheString1.lower():

	if EachLetter1 in TheKeepList1:

		NewString1 = NewString1 + EachLetter1
	# Else
		# Don't do anything
	# EndIf
# EndFor
print("This program removes everything except the a's: ")
print(NewString1)
print(" ")

################################################################
# PROGRAM Remove All The "a"s
################################################################

TheString2 = "The rain in Spain lies mainly in the plain"

NewString2 = ""

TheKeepList2 = {'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
        'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', ' '}

for EachLetter2 in TheString2.lower():

	if EachLetter2 in TheKeepList2:

		NewString2 = NewString2 + EachLetter2
	# Else
		# Don't do anything
	# EndIf
# EndFor

print("This program removes all the a's: ")
print(NewString2)

################################################################