import java.util.Scanner;

public class Main{
	static boolean check(String s, int A) {
		if(s.charAt(A) != '-') return false;
		String before = s.substring(0, A);
		String after = s.substring(A + 1);
		for(int i = 0; i < before.length(); i++) {
			if(!Character.isDigit(before.charAt(i))) return false;
		}
		for(int i = 0; i < after.length(); i++) {
			if(!Character.isDigit(after.charAt(i))) return false;
		}
		return true;
	}
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt(), B = sc.nextInt();
		String S = sc.next();
		System.out.println(check(S, A) ? "Yes" : "No");
	}
} import java.util.Scanner; Scanner java.util public class Main{
	static boolean check(String s, int A) {
		if(s.charAt(A) != '-') return false;
		String before = s.substring(0, A);
		String after = s.substring(A + 1);
		for(int i = 0; i < before.length(); i++) {
			if(!Character.isDigit(before.charAt(i))) return false;
		}
		for(int i = 0; i < after.length(); i++) {
			if(!Character.isDigit(after.charAt(i))) return false;
		}
		return true;
	}
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt(), B = sc.nextInt();
		String S = sc.next();
		System.out.println(check(S, A) ? "Yes" : "No");
	}
} Main static boolean check(String s, int A) {
		if(s.charAt(A) != '-') return false;
		String before = s.substring(0, A);
		String after = s.substring(A + 1);
		for(int i = 0; i < before.length(); i++) {
			if(!Character.isDigit(before.charAt(i))) return false;
		}
		for(int i = 0; i < after.length(); i++) {
			if(!Character.isDigit(after.charAt(i))) return false;
		}
		return true;
	} check {
		if(s.charAt(A) != '-') return false;
		String before = s.substring(0, A);
		String after = s.substring(A + 1);
		for(int i = 0; i < before.length(); i++) {
			if(!Character.isDigit(before.charAt(i))) return false;
		}
		for(int i = 0; i < after.length(); i++) {
			if(!Character.isDigit(after.charAt(i))) return false;
		}
		return true;
	} if(s.charAt(A) != '-') return false; s.charAt(A) != '-' s.charAt(A) s.charAt s A '-' return false; false String before = s.substring(0, A); before s.substring(0, A) s.substring s 0 A String after = s.substring(A + 1); after s.substring(A + 1) s.substring s A + 1 A 1 for(int i = 0; i < before.length(); i++) {
			if(!Character.isDigit(before.charAt(i))) return false;
		} int i = 0; int i = 0; i 0 i < before.length() i before.length() before.length before i++ i++ i {
			if(!Character.isDigit(before.charAt(i))) return false;
		} {
			if(!Character.isDigit(before.charAt(i))) return false;
		} if(!Character.isDigit(before.charAt(i))) return false; !Character.isDigit(before.charAt(i)) Character.isDigit(before.charAt(i)) Character.isDigit Character before.charAt(i) before.charAt before i return false; false for(int i = 0; i < after.length(); i++) {
			if(!Character.isDigit(after.charAt(i))) return false;
		} int i = 0; int i = 0; i 0 i < after.length() i after.length() after.length after i++ i++ i {
			if(!Character.isDigit(after.charAt(i))) return false;
		} {
			if(!Character.isDigit(after.charAt(i))) return false;
		} if(!Character.isDigit(after.charAt(i))) return false; !Character.isDigit(after.charAt(i)) Character.isDigit(after.charAt(i)) Character.isDigit Character after.charAt(i) after.charAt after i return false; false return true; true String s s int A A public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt(), B = sc.nextInt();
		String S = sc.next();
		System.out.println(check(S, A) ? "Yes" : "No");
	} main {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt(), B = sc.nextInt();
		String S = sc.next();
		System.out.println(check(S, A) ? "Yes" : "No");
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int A = sc.nextInt() A sc.nextInt() sc.nextInt sc B = sc.nextInt(); B sc.nextInt() sc.nextInt sc String S = sc.next(); S sc.next() sc.next sc System.out.println(check(S, A) ? "Yes" : "No") System.out.println System.out System System.out check(S, A) ? "Yes" : "No" check(S, A) check S A "Yes" "No" String[] args args public class Main{
	static boolean check(String s, int A) {
		if(s.charAt(A) != '-') return false;
		String before = s.substring(0, A);
		String after = s.substring(A + 1);
		for(int i = 0; i < before.length(); i++) {
			if(!Character.isDigit(before.charAt(i))) return false;
		}
		for(int i = 0; i < after.length(); i++) {
			if(!Character.isDigit(after.charAt(i))) return false;
		}
		return true;
	}
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt(), B = sc.nextInt();
		String S = sc.next();
		System.out.println(check(S, A) ? "Yes" : "No");
	}
} public class Main{
	static boolean check(String s, int A) {
		if(s.charAt(A) != '-') return false;
		String before = s.substring(0, A);
		String after = s.substring(A + 1);
		for(int i = 0; i < before.length(); i++) {
			if(!Character.isDigit(before.charAt(i))) return false;
		}
		for(int i = 0; i < after.length(); i++) {
			if(!Character.isDigit(after.charAt(i))) return false;
		}
		return true;
	}
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt(), B = sc.nextInt();
		String S = sc.next();
		System.out.println(check(S, A) ? "Yes" : "No");
	}
} Main
import java.util.Scanner;

public class Main{
	static boolean check(String s, int A) {
		if(s.charAt(A) != '-') return false;
		String before = s.substring(0, A);
		String after = s.substring(A + 1);
		for(int i = 0; i < before.length(); i++) {
			if(!Character.isDigit(before.charAt(i))) return false;
		}
		for(int i = 0; i < after.length(); i++) {
			if(!Character.isDigit(after.charAt(i))) return false;
		}
		return true;
	}
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt(), B = sc.nextInt();
		String S = sc.next();
		System.out.println(check(S, A) ? "Yes" : "No");
	}
}
