states={0:"z1",1:"z2",2:"f"}
active=True
activestate=0
intext=""

print("Alphabet: a, b .")
print("Im Endzustand beendet '.'")

while active:
	
	print("Zustand: " +states.get(activestate))
	userin = input("Eingabe: ")

	if activestate==0:
		if userin == "a":
			activestate=1
			intext=intext+userin
		else:
			pass
	elif activestate==1:
		if userin == "b":
			activestate=2
			intext=intext+userin
		else:
			pass
	elif activestate==2:
		if userin == "a":
			activestate=1
			intext=intext+userin
		elif userin == ".":
			intext=intext+userin
			active=False
		else:
			pass

print("Eingabe " + intext + " akzeptiert.")