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 JavaScript (node.js v5.12) (judge verdict: Accepted)

"use strict";

function main(input) {
    input = input.split(/\n|\s/)
    const a = ~~input[0]
    const b = ~~input[1]
    const s = input[2].split('-')

    let ans = 'No'
    if (s[0].length === a && s[1].length === b && s[0].match(/^[0-9]+$/) && s[1].match(/^[0-9]+$/)) {
        ans = 'Yes'
    }
    console.log(ans)
}
main(require("fs").readFileSync("/dev/stdin", "utf8"));