Problem:
Score : 200 points

Problem Statement

The postal code in Atcoder Kingdom is A+B+1 characters long, its (A+1)-th character is a hyphen -, and the other characters are digits from 0 through 9.

You are given a string S. Determine whether it follows the postal code format in Atcoder Kingdom.

Constraints

1≤A,B≤5

|S|=A+B+1

S consists of - and digits from 0 through 9.

Input

Input is given from Standard Input in the following format:

A B
S

Output

Print Yes if S follows the postal code format in AtCoder Kingdom; print No otherwise.

Sample Input 1

3 4
269-6650

Sample Output 1

Yes

The (A+1)-th character of S is -, and the other characters are digits from 0 through 9, so it follows the format.

Sample Input 2

1 1
---

Sample Output 2

No

S contains unnecessary -s other than the (A+1)-th character, so it does not follow the format.

Sample Input 3

1 2
7444

Sample Output 3

No

Solution in PHP (5.6.30) (judge verdict: Accepted)

<?php

$inputs = explode("\n", file_get_contents("php://stdin"));
list($meta, $postalCode) = $inputs;
list($a, $b) = array_map("intval", explode(" ", $meta));

$reg = "/^[0-9]{".$a."}-[0-9]{".$b."}$/";
if(preg_match($reg, $postalCode) === 1) {
  echo "Yes";
} else {
  echo "No";
}