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.

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.

Constraints

• 1≤A,B≤5
• |S|=A+B+1
• S consists of - and digits from 0 through 9.

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

见题面 Input 部分

见题面 Output 部分