import java.util.*;
import java.util.regex.Pattern;
import java.util.regex.Matcher;

public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        
        int x = sc.nextInt();
        int y = sc.nextInt();
        
        String postnumber = sc.next();
        
        
        Pattern pattern = Pattern.compile("^[0-9]{"+x+"}-[0-9]{"+y+"}$");
        Matcher matcher = pattern.matcher(postnumber);
        
        if(matcher.find()){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
        
        
    }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz