import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		List<Integer> listKaseki = getVersion(sc.next());
		List<Integer> listJudge = getVersion(sc.next());
		sc.close();
		if(JudgeVersion(listKaseki, listJudge)){
			System.out.println("YES");
		}else{
			System.out.println("NO");
		}
	}

	public static List<Integer> getVersion(String version){
		List<Integer> list = new ArrayList<Integer>();
		int index = version.indexOf(".");
		list.add(Integer.parseInt(version.substring(0, index)));
		String version2 = version.substring(index + 1);
		index = version2.indexOf(".");
		list.add(Integer.parseInt(version2.substring(0, index)));
		list.add(Integer.parseInt(version2.substring(index + 1)));
		return list;
	}

	public static boolean JudgeVersion(List<Integer> listKaseki, List<Integer> listJudge){
		if(listKaseki.get(0) < listJudge.get(0)){
			return false;
		}else if(listKaseki.get(0) > listJudge.get(0)){
			return true;
		}else{
			if(listKaseki.get(1) < listJudge.get(1)){
				return false;
			}else if(listKaseki.get(1) > listJudge.get(1)){
				return true;
			}else{
				if(listKaseki.get(1) < listJudge.get(1)){
					return false;
				}else{
					return true;
				}
			}
		}
	}
}