
import java.util.Scanner;

class Main{
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		int mae=sc.nextInt();
		int ato=sc.nextInt();

		String moji=sc.next();
		String[] aa=moji.split("-");
		if(aa.length==2 && aa[0].length()==mae && aa[1].length()==ato) {
			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