import java.util.*;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String A = sc.next();
		String B = sc.next();
		String S = sc.next();

		if (S.matches("^[\\d]{"+A+"}-[\\d]{"+B+"}$")) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
} import java.util.*; util.* java public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String A = sc.next();
		String B = sc.next();
		String S = sc.next();

		if (S.matches("^[\\d]{"+A+"}-[\\d]{"+B+"}$")) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
} Main public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String A = sc.next();
		String B = sc.next();
		String S = sc.next();

		if (S.matches("^[\\d]{"+A+"}-[\\d]{"+B+"}$")) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	} main {
		Scanner sc = new Scanner(System.in);
		String A = sc.next();
		String B = sc.next();
		String S = sc.next();

		if (S.matches("^[\\d]{"+A+"}-[\\d]{"+B+"}$")) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String A = sc.next(); A sc.next() sc.next sc String B = sc.next(); B sc.next() sc.next sc String S = sc.next(); S sc.next() sc.next sc if (S.matches("^[\\d]{"+A+"}-[\\d]{"+B+"}$")) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		} S.matches("^[\\d]{"+A+"}-[\\d]{"+B+"}$") S.matches S "^[\\d]{"+A+"}-[\\d]{"+B+"}$" B "}-[\\d]{" "^[\\d]{"+A+"}-[\\d]{"+B+"}$" "^[\\d]{" A "}-[\\d]{" B "}$" {
			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);
		String A = sc.next();
		String B = sc.next();
		String S = sc.next();

		if (S.matches("^[\\d]{"+A+"}-[\\d]{"+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);
		String A = sc.next();
		String B = sc.next();
		String S = sc.next();

		if (S.matches("^[\\d]{"+A+"}-[\\d]{"+B+"}$")) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
} Main
import java.util.*;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String A = sc.next();
		String B = sc.next();
		String S = sc.next();

		if (S.matches("^[\\d]{"+A+"}-[\\d]{"+B+"}$")) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
}