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: Wrong Answer)

// inputに入力データ全体が入る
function Main(input) {
	var line = input.split("\n");
	var A = Number(line[0].split(" ")[0]);
	var B = Number(line[1].split(" ")[1]);
	var S = line[1];

	var isPostalCode = function(A,B,S){
		var regA = new RegExp('^\\d{' + A + '}$');
		var regB = new RegExp('^\\d{' + B + '}$');
		return (regA.test(S.slice(0,A)) && S[A] === "-" && regB.test(S.slice(A+1)));
	}

	if(isPostalCode(A,B,S)) console.log("Yes");
	else console.log("No");

	return false;

}

//*この行以降は編集しないでください（標準入出力から一度に読み込み、Mainを呼び出します）
Main(require("fs").readFileSync("/dev/stdin", "utf8"));