import java.util.Scanner;

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();
		
		if(s.charAt(a) == '-') {
		
		}else {
			System.out.println("No");
			return;
		}
		s = s.substring(0, a) + s.substring(a+1);
		for (Character c : s.toCharArray()) {
			if(Character.isDigit(c)) {
				
			}else {
				System.out.println("No");
				return;
			}
		}
		System.out.println("Yes");
		
	}

} import java.util.Scanner; Scanner java.util 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();
		
		if(s.charAt(a) == '-') {
		
		}else {
			System.out.println("No");
			return;
		}
		s = s.substring(0, a) + s.substring(a+1);
		for (Character c : s.toCharArray()) {
			if(Character.isDigit(c)) {
				
			}else {
				System.out.println("No");
				return;
			}
		}
		System.out.println("Yes");
		
	}

} 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();
		
		if(s.charAt(a) == '-') {
		
		}else {
			System.out.println("No");
			return;
		}
		s = s.substring(0, a) + s.substring(a+1);
		for (Character c : s.toCharArray()) {
			if(Character.isDigit(c)) {
				
			}else {
				System.out.println("No");
				return;
			}
		}
		System.out.println("Yes");
		
	} main {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		String s = sc.next();
		
		if(s.charAt(a) == '-') {
		
		}else {
			System.out.println("No");
			return;
		}
		s = s.substring(0, a) + s.substring(a+1);
		for (Character c : s.toCharArray()) {
			if(Character.isDigit(c)) {
				
			}else {
				System.out.println("No");
				return;
			}
		}
		System.out.println("Yes");
		
	} 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 if(s.charAt(a) == '-') {
		
		}else {
			System.out.println("No");
			return;
		} s.charAt(a) == '-' s.charAt(a) s.charAt s a '-' {
		
		} {
			System.out.println("No");
			return;
		} System.out.println("No") System.out.println System.out System System.out "No" return; s = s.substring(0, a) + s.substring(a+1) s s.substring(0, a) + s.substring(a+1) s.substring(0, a) s.substring s 0 a s.substring(a+1) s.substring s a+1 a 1 for (Character c : s.toCharArray()) {
			if(Character.isDigit(c)) {
				
			}else {
				System.out.println("No");
				return;
			}
		} Character c s.toCharArray() s.toCharArray s {
			if(Character.isDigit(c)) {
				
			}else {
				System.out.println("No");
				return;
			}
		} {
			if(Character.isDigit(c)) {
				
			}else {
				System.out.println("No");
				return;
			}
		} if(Character.isDigit(c)) {
				
			}else {
				System.out.println("No");
				return;
			} Character.isDigit(c) Character.isDigit Character c {
				
			} {
				System.out.println("No");
				return;
			} System.out.println("No") System.out.println System.out System System.out "No" return; System.out.println("Yes") System.out.println System.out System System.out "Yes" 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();
		
		if(s.charAt(a) == '-') {
		
		}else {
			System.out.println("No");
			return;
		}
		s = s.substring(0, a) + s.substring(a+1);
		for (Character c : s.toCharArray()) {
			if(Character.isDigit(c)) {
				
			}else {
				System.out.println("No");
				return;
			}
		}
		System.out.println("Yes");
		
	}

} 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();
		
		if(s.charAt(a) == '-') {
		
		}else {
			System.out.println("No");
			return;
		}
		s = s.substring(0, a) + s.substring(a+1);
		for (Character c : s.toCharArray()) {
			if(Character.isDigit(c)) {
				
			}else {
				System.out.println("No");
				return;
			}
		}
		System.out.println("Yes");
		
	}

} Main
import java.util.Scanner;

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();
		
		if(s.charAt(a) == '-') {
		
		}else {
			System.out.println("No");
			return;
		}
		s = s.substring(0, a) + s.substring(a+1);
		for (Character c : s.toCharArray()) {
			if(Character.isDigit(c)) {
				
			}else {
				System.out.println("No");
				return;
			}
		}
		System.out.println("Yes");
		
	}

}