def delta0(q, e):
res = set()
if q == "q0":
if e == "a":
res = {"q2"}
elif e == "b":
res = {"q1"}
elif q == "q1":
if e == "a":
res = {"q3"}
elif e == "b":
res = {"q0"}
elif q == "q2":
if e == "a":
res = {"q2"}
elif e == "b":
res = {"q1"}
elif q == "q3":
if e == "a":
res = {"q3"}
elif e == "b":
res = {"q3"}
return res
automata = Automaton(states, alphabet, delta0, initial_state, final_states)
print(automata.execute({"q0"}, "a"))
print(automata.get_anti_language(5))
