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B - Postal Code

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.

3 4
269-6650

Yes

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

1 1
---

No

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

1 2
7444

No