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 Java7 (OpenJDK 1.7.0) (judge verdict: Accepted)

import java.util.*;
class Main{

     public static void main(String []args){
      Scanner scan = new Scanner(System.in);
      int m = scan.nextInt() ;
      int n = scan.nextInt() ;
       String s = scan.next();
      char arr[] = s.toCharArray();
      //for(int i = 0 ; i < m+n+1 ; i++){
       //   arr[i] = scan.next().charAt(0);
      //}
      int count = 0 ; 
      if(arr[m] == '-'){
          for(int i = 0 ; i<m+n+1 ; i++){
              if(i == m){
                  continue ;
              }
              if(arr[i]>='0' && arr[i]<='9'){
                  count++;
              }
          }
        	//System.out.println(count);
           if(count == m+n){
                System.out.println("Yes");
             }else{
            System.out.println("No");
             }
      
      }else{
          System.out.println("No");
      }   
    }
}