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: Runtime Error)

import java.util.*;
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();
      
      int s1;
      boolean ans = true;

      if(s.charAt(a)!='-'){
        System.out.println("No");
        System.exit(0);
      }

      for(int i =0;i<a;i++){
        s1 = (int)s.charAt(i);
        if(s1>=48&&s1<58){
          ans=true;
        }else{
          System.out.println("No");
          System.exit(0);
        }
      }

      for(int i =a+1;i<s.length();i++){
        s1 = (int)s.charAt(i);
        if(s1>=48&&s1<58){
          ans=true;
        }else{
          System.out.println("No");
          System.exit(0);
        }

      }
      if(ans){
        System.out.println("Yes");
      }

  }
}