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

import static java.lang.System.*;
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		B(sc);
	}
	
	public static void A(Scanner sc) {
		int m = sc.nextInt();
		out.println(24-m+24);
	}
	
	public static void B(Scanner sc) {
		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);
		if(m.find()) out.println("Yes");
		else out.println("No");
	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz