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)

/*
長さの制約を忘れていた
どもるがんの法則、間が&&ではなく||だった
*/

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 blank = sc.nextLine();
    String s = sc.nextLine();
    int i = 0;
    boolean flag = true;

    if(s.charAt(a) != '-'){flag = false;}
    for(char c : s.toCharArray()){
      i++;
      if(i == a){continue;}
      if(!('0' <= c) || !(c <= '9')){flag = false; break;}
      //i++;
      //continueされたときにiiを進めれてないのが問題
    }
    if(s.length() != a+b+1){flag = false;}

    if(flag){System.out.println("Yes");}
    else{System.out.println("No");}

  }
}

/*
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
String blank = sc.nextLine();
String s = sc.nextLine();
System.out.println();
System.exit(0)
*/