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 C++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <iostream>

using namespace std;

int main(){
  int postal_count[2];
  for(auto i = 0; 2 > i; ++i){
    cin >> postal_count[i];
  }
  string postal_code;
  cin >> postal_code;

  auto pos = postal_code.find("-");

  if(pos != string::npos){
    if(postal_count[0] == (int)pos && (postal_code.length() - (int)pos - 1) == postal_count[1]){
      cout << "Yes" << endl;
    } else {
      cout << "No" << endl;
    }
  }else{
    cout << "No" << endl;
  }

  return 0;
}