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.*;
import java.io.*;

class Main {
  int A, B, len;
  String S;
  char[] cS;
  boolean flg;
  public static void main(String[] args) {
    Main m = new Main();
    m.input();
    m.solve();
    m.out();
  }

  public void input() {
    Scanner sc = new Scanner(System.in);
    A = sc.nextInt();
    B = sc.nextInt();
    S = sc.next();
    cS = S.toCharArray();
    len = cS.length;
  }

  public void solve() {
    if(len == A + B + 1) {
      if(cS[A] == '-') {
        for(int i = 0; i < A; i++) {
          if(cS[i] >= '0' && cS[i] <= '9') {
            flg = true;
          } else {
            flg = false;
            break;
          }
        }
        if(flg == true) {
          for(int i = A + 1; i < len; i++) {
            if(cS[i] >= '0' && cS[i] <= '9') {
              flg = true;
            } else {
              flg = false;
              break;
            }
          }
        }
      } else {
        flg = false;
      }
    } else {
      flg = false;
    }
  }

  public void out() {
    if(flg == true) {
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  }
}