import java.io.*;

class Main {
    public static void main(String[] args) {
        try {
            L lexer = new L(new DataInputStream(System.in));
            P parser = new P(lexer);
            parser.prog();
	    System.out.println(parser.getAST().toStringList());
        } catch(Exception e) {
            System.err.println("exception: "+e);
        }
    }
}