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 Kotlin (1.0.0) (judge verdict: Accepted)

fun main(args: Array<String>) {
    val inputNum = readLine()?.split(" ").orEmpty()
    val numA = inputNum[0].toInt()
    val numB = inputNum[1].toInt()

    val postal = readLine().orEmpty()
    val reg = "\\d{$numA}-\\d{$numB}"
    val checkR = Regex(reg)
    val a = checkR.matchEntire(postal)?.value
    var result = "Yes"

    if(a.isNullOrBlank()){
        result = "No"
    }
    println(result)
}