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: Wrong Answer)

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc =new Scanner(System.in);
		int A=sc.nextInt();
		int B=sc.nextInt();
		String S=sc.next();
		S.toCharArray();
		String h="-";
		int cnt=0;
		for(int i=0;i<S.length();i++) {
			if(h.equals(S.charAt(i))) {
				cnt++;
			}
		}
		if(S.indexOf("-")+1==A+1 && S.length()==A+B+1 && cnt==1) {
			System.out.println("Yes");
		}else System.out.println("No");
	}
}