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();
		StringBuilder sb = new StringBuilder();
		sb.append("^");
		for(int i = 0 ; i < a ; i++) {
			sb.append("[0-9]");
		}
		sb.append("-");
		for(int i = 0 ; i < b ; i++) {
			sb.append("[0-9]");
		}
		sb.append("$");
		Pattern p = Pattern.compile(sb.toString());
		Matcher m = p.matcher(s);
		System.out.println(m.matches() ? "Yes" : "No");
		sc.close();

	}

} 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();
		StringBuilder sb = new StringBuilder();
		sb.append("^");
		for(int i = 0 ; i < a ; i++) {
			sb.append("[0-9]");
		}
		sb.append("-");
		for(int i = 0 ; i < b ; i++) {
			sb.append("[0-9]");
		}
		sb.append("$");
		Pattern p = Pattern.compile(sb.toString());
		Matcher m = p.matcher(s);
		System.out.println(m.matches() ? "Yes" : "No");
		sc.close();

	}

} 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();
		StringBuilder sb = new StringBuilder();
		sb.append("^");
		for(int i = 0 ; i < a ; i++) {
			sb.append("[0-9]");
		}
		sb.append("-");
		for(int i = 0 ; i < b ; i++) {
			sb.append("[0-9]");
		}
		sb.append("$");
		Pattern p = Pattern.compile(sb.toString());
		Matcher m = p.matcher(s);
		System.out.println(m.matches() ? "Yes" : "No");
		sc.close();

	} main {

		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		String s = sc.next();
		StringBuilder sb = new StringBuilder();
		sb.append("^");
		for(int i = 0 ; i < a ; i++) {
			sb.append("[0-9]");
		}
		sb.append("-");
		for(int i = 0 ; i < b ; i++) {
			sb.append("[0-9]");
		}
		sb.append("$");
		Pattern p = Pattern.compile(sb.toString());
		Matcher m = p.matcher(s);
		System.out.println(m.matches() ? "Yes" : "No");
		sc.close();

	} 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 StringBuilder sb = new StringBuilder(); sb new StringBuilder() sb.append("^") sb.append sb "^" for(int i = 0 ; i < a ; i++) {
			sb.append("[0-9]");
		} int i = 0 ; int i = 0 ; i 0 i < a i a i++ i++ i {
			sb.append("[0-9]");
		} {
			sb.append("[0-9]");
		} sb.append("[0-9]") sb.append sb "[0-9]" sb.append("-") sb.append sb "-" for(int i = 0 ; i < b ; i++) {
			sb.append("[0-9]");
		} int i = 0 ; int i = 0 ; i 0 i < b i b i++ i++ i {
			sb.append("[0-9]");
		} {
			sb.append("[0-9]");
		} sb.append("[0-9]") sb.append sb "[0-9]" sb.append("$") sb.append sb "$" Pattern p = Pattern.compile(sb.toString()); p Pattern.compile(sb.toString()) Pattern.compile Pattern sb.toString() sb.toString sb Matcher m = p.matcher(s); m p.matcher(s) p.matcher p s System.out.println(m.matches() ? "Yes" : "No") System.out.println System.out System System.out m.matches() ? "Yes" : "No" m.matches() m.matches m "Yes" "No" sc.close() sc.close sc 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();
		StringBuilder sb = new StringBuilder();
		sb.append("^");
		for(int i = 0 ; i < a ; i++) {
			sb.append("[0-9]");
		}
		sb.append("-");
		for(int i = 0 ; i < b ; i++) {
			sb.append("[0-9]");
		}
		sb.append("$");
		Pattern p = Pattern.compile(sb.toString());
		Matcher m = p.matcher(s);
		System.out.println(m.matches() ? "Yes" : "No");
		sc.close();

	}

} 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();
		StringBuilder sb = new StringBuilder();
		sb.append("^");
		for(int i = 0 ; i < a ; i++) {
			sb.append("[0-9]");
		}
		sb.append("-");
		for(int i = 0 ; i < b ; i++) {
			sb.append("[0-9]");
		}
		sb.append("$");
		Pattern p = Pattern.compile(sb.toString());
		Matcher m = p.matcher(s);
		System.out.println(m.matches() ? "Yes" : "No");
		sc.close();

	}

} 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();
		StringBuilder sb = new StringBuilder();
		sb.append("^");
		for(int i = 0 ; i < a ; i++) {
			sb.append("[0-9]");
		}
		sb.append("-");
		for(int i = 0 ; i < b ; i++) {
			sb.append("[0-9]");
		}
		sb.append("$");
		Pattern p = Pattern.compile(sb.toString());
		Matcher m = p.matcher(s);
		System.out.println(m.matches() ? "Yes" : "No");
		sc.close();

	}

}
