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) throws Exception {
        Scanner sc = new Scanner(System.in);
        int first = Integer.parseInt(sc.next());
        int second = Integer.parseInt(sc.next());
        String postCd = sc.next();
        for(int x=1; x<=first;x++) {
            try {
                Integer.parseInt(postCd.substring(x-1,x));
            } catch(Exception e){
                System.out.println("No");
                return;
            }
        }
        if(!postCd.substring(first,first+1).equals("-")) {
            System.out.println("No");
            return;
        }
        for(int x=first+2; x<=first+second+1;x++) {
            try {
                Integer.parseInt(postCd.substring(x-1,x));
            } catch(Exception e){
                System.out.println("No");
                return;
            }
        }
        System.out.println("Yes");
    }
}