import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		String s = sc.next();
		sc.close();
		
		if (s.matches("^\\d{" +a+ "}-\\d{" +b+ "}$")) {
			System.out.println("Yes");
	    } else {
			System.out.println("No");
		}
		
	}

} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		String s = sc.next();
		sc.close();
		
		if (s.matches("^\\d{" +a+ "}-\\d{" +b+ "}$")) {
			System.out.println("Yes");
	    } else {
			System.out.println("No");
		}
		
	}

} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		String s = sc.next();
		sc.close();
		
		if (s.matches("^\\d{" +a+ "}-\\d{" +b+ "}$")) {
			System.out.println("Yes");
	    } else {
			System.out.println("No");
		}
		
	} main {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		String s = sc.next();
		sc.close();
		
		if (s.matches("^\\d{" +a+ "}-\\d{" +b+ "}$")) {
			System.out.println("Yes");
	    } else {
			System.out.println("No");
		}
		
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc int b = sc.nextInt(); b sc.nextInt() sc.nextInt sc String s = sc.next(); s sc.next() sc.next sc sc.close() sc.close sc if (s.matches("^\\d{" +a+ "}-\\d{" +b+ "}$")) {
			System.out.println("Yes");
	    } else {
			System.out.println("No");
		} s.matches("^\\d{" +a+ "}-\\d{" +b+ "}$") s.matches s "^\\d{" +a+ "}-\\d{" +b+ "}$" b "}-\\d{" "^\\d{" +a+ "}-\\d{" +b+ "}$" "^\\d{" a "}-\\d{" b "}$" {
			System.out.println("Yes");
	    } System.out.println("Yes") System.out.println System.out System System.out "Yes" {
			System.out.println("No");
		} System.out.println("No") System.out.println System.out System System.out "No" String[] args args public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		String s = sc.next();
		sc.close();
		
		if (s.matches("^\\d{" +a+ "}-\\d{" +b+ "}$")) {
			System.out.println("Yes");
	    } else {
			System.out.println("No");
		}
		
	}

} public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		String s = sc.next();
		sc.close();
		
		if (s.matches("^\\d{" +a+ "}-\\d{" +b+ "}$")) {
			System.out.println("Yes");
	    } else {
			System.out.println("No");
		}
		
	}

} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		String s = sc.next();
		sc.close();
		
		if (s.matches("^\\d{" +a+ "}-\\d{" +b+ "}$")) {
			System.out.println("Yes");
	    } else {
			System.out.println("No");
		}
		
	}

}
