import java.util.*;

public class Main
{
    private final static Main main = new Main();

    public static void main(String[] args)
    {
        long l = System.currentTimeMillis();
        main.answer();
        //System.err.println("経過時間:"+(System.currentTimeMillis() - l));
    }

    private void answer()
    {
        Scanner sc = new Scanner(System.in);
        String[] as = sc.nextLine().split("\\.");
        int a = Integer.valueOf(as[0])*100 + Integer.valueOf(as[1])*10 + Integer.valueOf(as[2]);
        String[] bs = sc.nextLine().split("\\.");
        int b = Integer.valueOf(bs[0])*100 + Integer.valueOf(bs[1])*10 + Integer.valueOf(bs[2]);
        sc.close();
        System.out.println(a>b?"YES":"NO");
    }
}