import java.util.ArrayList;

public class Out {
    static final ArrayList<String> output = new ArrayList<>();

    private Out() { throw new IllegalStateException("Utility class"); }

    public static void println(String string) {
        output.add(string);
    }

    public static void println() {
        println("");
    }

    public static String get() {
        StringBuilder string = new StringBuilder();
        for (String s : output) {
            string.append(s);
            string.append("\n");
        }
        return string.toString();
    }
}