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 <iostream>
#include <stdio.h>
#include <algorithm>
#include <numeric>
#include <functional>
#include <vector>
#include <string>

using namespace std;
char s[12];

int main() {

	int a, b;
	cin >> a >> b;
	cin >> s;

	int cnt1 = 0;
	int cnt2 = 0;
	int cnt3 = 0;

	for (int k = 0; k < a; ++k) {
		if (s[k] >= '0' && s[k] <= '9') {
			cnt1++;
		}
	}

	if (s[a] == '-') {
		cnt2++;
	}

	for (int k = a + 1; k <= a + b; ++k) {
		if (s[k] >= '0' && s[k] <= '9') {
			cnt3++;
		}
	}

	if (cnt1 == a && cnt2 == 1 && cnt3 == b) {
		cout << "Yes" << endl;
	}
	else {
		cout << "No" << endl;
	}

	return 0;
}