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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


public class Main {

	/**
	 * @param args
	 * @throws IOException 
	 */
	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		String input = br.readLine();
		String[] tmpArray = input.split(" ");
		int a = Integer.parseInt(tmpArray[0]);
		int b = Integer.parseInt(tmpArray[1]);
		
		String posStr = br.readLine();
		String[] postal = posStr.split("-", -1);
//		Pattern p = Pattern.compile("[\\d]++");
//		Matcher m = p.matcher(arg0)
		boolean available = false;
		if(posStr.charAt(a) != '-'){
			available = false;
		}
		else if(postal.length != 2){
			available = false;
		}
		
//		else if(!postal[1].equals("-")){
//			available = false;
//		}
		else if(postal[0].length() == a && Pattern.matches("\\d++", postal[0])
			&& postal[1].length() == b && Pattern.matches("\\d++", postal[1])){
			available = true;
		}
		
		if(available){
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		}
	}

}