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: Accepted)

#include <algorithm>
#include <stdio.h>
#include <iostream>
using namespace std;
using ll = long long;


int main(){
    ll A,B;
    bool b1 = true;
    cin >> A >> B;
    string str;
    cin >> str;
    for (int i=0;i<=A+B;i++){
        if((i==A && str[i] != '-')||(i != A && str[i]=='-')){
        b1 = false;
        }
    }
    if (b1 == true){
        cout << "Yes" << endl;
    }else{
        cout << "No" << endl;
    }
    return 0;
}