import java.util.Scanner;

public class Main {
    public static void main (String [] args){
        Scanner sc = new Scanner(System.in);
        int A =sc.nextInt();
        int B =sc.nextInt();
        String S =sc.next();
        boolean flag = true;
        String[] w =S.split("-");
        if (w.length != 2){
            flag = false;
        }else{
            if(w[0].length() !=A){
                flag = false;
            }
            if(w[1].length() != B){
                flag = false;
            }
        }
        if(flag){
            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