import java.util.Scanner;
import java.util.regex.*;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ

		Scanner cd = new Scanner(System.in);
		int a = cd.nextInt();
		int b = cd.nextInt();
		String s = cd.next();
		if(s.matches("[0-9]{"+a+"}-[0-9]{"+b+"}")) {
			System.out.println("Yes");
		}else System.out.println("No");
	}

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

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ

		Scanner cd = new Scanner(System.in);
		int a = cd.nextInt();
		int b = cd.nextInt();
		String s = cd.next();
		if(s.matches("[0-9]{"+a+"}-[0-9]{"+b+"}")) {
			System.out.println("Yes");
		}else System.out.println("No");
	}

} Main public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ

		Scanner cd = new Scanner(System.in);
		int a = cd.nextInt();
		int b = cd.nextInt();
		String s = cd.next();
		if(s.matches("[0-9]{"+a+"}-[0-9]{"+b+"}")) {
			System.out.println("Yes");
		}else System.out.println("No");
	} main {
		// TODO 自動生成されたメソッド・スタブ

		Scanner cd = new Scanner(System.in);
		int a = cd.nextInt();
		int b = cd.nextInt();
		String s = cd.next();
		if(s.matches("[0-9]{"+a+"}-[0-9]{"+b+"}")) {
			System.out.println("Yes");
		}else System.out.println("No");
	} Scanner cd = new Scanner(System.in); cd new Scanner(System.in) int a = cd.nextInt(); a cd.nextInt() cd.nextInt cd int b = cd.nextInt(); b cd.nextInt() cd.nextInt cd String s = cd.next(); s cd.next() cd.next cd if(s.matches("[0-9]{"+a+"}-[0-9]{"+b+"}")) {
			System.out.println("Yes");
		}else System.out.println("No"); s.matches("[0-9]{"+a+"}-[0-9]{"+b+"}") s.matches s "[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 System.out System System.out "No" String[] args args public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ

		Scanner cd = new Scanner(System.in);
		int a = cd.nextInt();
		int b = cd.nextInt();
		String s = cd.next();
		if(s.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) {
		// TODO 自動生成されたメソッド・スタブ

		Scanner cd = new Scanner(System.in);
		int a = cd.nextInt();
		int b = cd.nextInt();
		String s = cd.next();
		if(s.matches("[0-9]{"+a+"}-[0-9]{"+b+"}")) {
			System.out.println("Yes");
		}else System.out.println("No");
	}

} Main
import java.util.Scanner;
import java.util.regex.*;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ

		Scanner cd = new Scanner(System.in);
		int a = cd.nextInt();
		int b = cd.nextInt();
		String s = cd.next();
		if(s.matches("[0-9]{"+a+"}-[0-9]{"+b+"}")) {
			System.out.println("Yes");
		}else System.out.println("No");
	}

}
