In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.

Ex Input:
Question: For which of the following children's problems has the effectiveness of the symbolic modeling technique been demonstrated? 
 Options:  <1> Childhood depression <2> Behavioral disorders associated with ADHD. <3> The autism <4> The shyness. <5> The selective mutism.

Ex Output:
4


Ex Input:
Question: Which of the following enzyme complexes catalyzes the reduction of molecular oxygen to water during oxidative phosphorylation? 
 Options:  <1> ATP synthase. <2> Cytochrome c oxidase. <3> NADH-Q oxide-reductase. <4> Q-cytochrome c-oxide-reductase. <5> Succinate-Q reductase.

Ex Output:
2


Ex Input:
Question: The following are obtained only by chemical synthesis: 
 Options:  <1> Penicillins <2> Cephalosporins. <3> Macrolides <4> Aminoglycosides <5> Quinolones

Ex Output:

5