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 string = sc.next();
		if (string.matches("[0-9]{"+A+"}-[0-9]{"+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 string = sc.next();
		if (string.matches("[0-9]{"+A+"}-[0-9]{"+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 string = sc.next();
		if (string.matches("[0-9]{"+A+"}-[0-9]{"+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 string = sc.next();
		if (string.matches("[0-9]{"+A+"}-[0-9]{"+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 string = sc.next(); string sc.next() sc.next sc if (string.matches("[0-9]{"+A+"}-[0-9]{"+B+"}")) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		} string.matches("[0-9]{"+A+"}-[0-9]{"+B+"}") string.matches string "[0-9]{"+A+"}-[0-9]{"+B+"}" B "}-[0-9]{" "[0-9]{"+A+"}-[0-9]{"+B+"}" "[0-9]{" A "}-[0-9]{" 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 string = sc.next();
		if (string.matches("[0-9]{"+A+"}-[0-9]{"+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 string = sc.next();
		if (string.matches("[0-9]{"+A+"}-[0-9]{"+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 string = sc.next();
		if (string.matches("[0-9]{"+A+"}-[0-9]{"+B+"}")) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
	}
}


