import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
public class Main{
	public static void main(String[] args){
	    Scanner sc = new Scanner(System.in);
    	int num1 = sc.nextInt();
        int num2 = sc.nextInt();
		String pc = sc.next();
        Pattern p = Pattern.compile("^[0-9]{"+ num1 +"}-[0-9]{"+ num2 +"}$");
        Matcher m = p.matcher(pc);
        if(m.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