import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

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();
		Pattern p = Pattern.compile("^[0-9]{" + A +"}"+"[-]"+"[0-9]{" + B + "}$");
		Matcher m = p.matcher(S);
		System.out.println(m.find() ? "Yes":"No");
	}
} import java.util.Scanner; Scanner java.util import java.util.regex.Matcher; Matcher java.util.regex import java.util.regex.Pattern; Pattern java.util.regex public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		String S = sc.next();
		Pattern p = Pattern.compile("^[0-9]{" + A +"}"+"[-]"+"[0-9]{" + B + "}$");
		Matcher m = p.matcher(S);
		System.out.println(m.find() ? "Yes":"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();
		Pattern p = Pattern.compile("^[0-9]{" + A +"}"+"[-]"+"[0-9]{" + B + "}$");
		Matcher m = p.matcher(S);
		System.out.println(m.find() ? "Yes":"No");
	} main {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		String S = sc.next();
		Pattern p = Pattern.compile("^[0-9]{" + A +"}"+"[-]"+"[0-9]{" + B + "}$");
		Matcher m = p.matcher(S);
		System.out.println(m.find() ? "Yes":"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 Pattern p = Pattern.compile("^[0-9]{" + A +"}"+"[-]"+"[0-9]{" + B + "}$"); p Pattern.compile("^[0-9]{" + A +"}"+"[-]"+"[0-9]{" + B + "}$") Pattern.compile Pattern "^[0-9]{" + A +"}"+"[-]"+"[0-9]{" + B + "}$" B "[0-9]{" "[-]" "}" "^[0-9]{" + A +"}"+"[-]"+"[0-9]{" + B + "}$" "^[0-9]{" A "}" "[-]" "[0-9]{" B "}$" Matcher m = p.matcher(S); m p.matcher(S) p.matcher p S System.out.println(m.find() ? "Yes":"No") System.out.println System.out System System.out m.find() ? "Yes":"No" m.find() m.find m "Yes" "No" String[] args args public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		String S = sc.next();
		Pattern p = Pattern.compile("^[0-9]{" + A +"}"+"[-]"+"[0-9]{" + B + "}$");
		Matcher m = p.matcher(S);
		System.out.println(m.find() ? "Yes":"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();
		Pattern p = Pattern.compile("^[0-9]{" + A +"}"+"[-]"+"[0-9]{" + B + "}$");
		Matcher m = p.matcher(S);
		System.out.println(m.find() ? "Yes":"No");
	}
} Main
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

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();
		Pattern p = Pattern.compile("^[0-9]{" + A +"}"+"[-]"+"[0-9]{" + B + "}$");
		Matcher m = p.matcher(S);
		System.out.println(m.find() ? "Yes":"No");
	}
}
