import java.util.*;
public class Main{public static void main(String[]args){
Scanner sc=new Scanner(System.in);
  int a=sc.nextInt();
  int b=sc.nextInt();
  String po=sc.next();
  String s[]=po.split("-",0);
  System.out.println((s.length==2)?(s[0].length()==a&&s[1].length()==b)?"Yes":"No":"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