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.*;

public class Main{
	public static void main(String[] args){
		
		try(
		BufferedReader br = new BufferedReader( new InputStreamReader(System.in));
		){
			String[] str = br.readLine().split(" ");
			int A = Integer.parseInt(str[0]);
			int B = Integer.parseInt(str[1]);
			
			String postalCode = br.readLine();
			
			String reg = "\\d{" + A + "}-\\d{" + B + "}";
			if(postalCode.matches(reg)){
				System.out.println("Yes");
			}else{
				System.out.println("No");
			}
		}catch(IOException e){
			e.printStackTrace();
		}
	}
}