100841: [AtCoder]ABC084 B - Postal Code

Memory Limit:256 MB Time Limit:2 S
Judge Style:Text Compare Creator:
Submit:0 Solved:0

Description

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

Input

题意翻译

输入A,B 再输入字符串S,S的长度为A+B+1 如果除了S的第A+1个字符,其他有一个或以上不为0~9 或 如果第A+1个字符不为字符'-' 输出"No" 否则输出"Yes" 翻译提供者:RioBlu

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