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.util.*;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		boolean j = true;
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		String s = sc.next();
		String[] strArray = s.split("");
		if(strArray.length != a+b+1) j = false;
		if(strArray[a].equals("-")) {
			for(int i = 0;i < strArray.length;i++) {
				if(i != a) {
					if(!(strArray[i].equals("-"))) {
						int x = Integer.parseInt(strArray[i]);
						if(x >= 10 && x < 0) j = false;
					}
					else j = false;
				}
			}
		}
		else j = false;
		if(j) System.out.println("Yes");
		else if(!j) System.out.println("No");
		sc.close();	
	}
}