The postal code in Atcoder Kingdom is A+B+1 characters long, its (A+1)-th character is a hyphen `-`, and the other characters are digits from `0` through `9`.

You are given a string S. Determine whether it follows the postal code format in Atcoder Kingdom.

Constraints

* 1≤A,B≤5
* |S|=A+B+1
* S consists of `-` and digits from `0` through `9`.

Input

Input is given from Standard Input in the following format:


A B
S


Output

Print `Yes` if S follows the postal code format in AtCoder Kingdom; print `No` otherwise.

Examples

Input

3 4
269-6650


Output

Yes


Input

1 1
---


Output

No


Input

1 2
7444


Output

No
import java.util.Scanner;
public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc=new Scanner(System.in);
		int a=sc.nextInt();
		int b=sc.nextInt();
		boolean flag=true;
		String s=sc.next();

		for(int i=0;i<a+b+1;i++) {
			if((i!=(a))&&!('0' <= s.charAt(i) && s.charAt(i) <= '9'))	flag=false;
		}
		if(!(s.charAt(a)=='-'))flag=false;
		
		if(flag)		System.out.println("Yes");
		else		System.out.println("No");
		
	}
}