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 <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef vector<int> pi;
typedef pair<int,int> vi;

#define F first
#define S second
#define PB push_back
#define MK make_pair
#define REP(i, a, b) for (int i=a; i < b; i++)


bool sort_by(vi c, vi d){
	return c.S < d.S;
}

bool check(int j, string s1){
	if(s1[j] == '-') return true;
	else return false;
}


int main() {
	int a, b;
	string s;
	cin >> a >> b >> s;
	REP(i, 0, a){
		if(check(i, s)){
			cout << "No";
			exit(0);
		}
	}
	if(!check(a, s)){
		cout << "No";
		exit(0);
	}
	REP(i, a+1 , a+b+1){
		if(check(i, s)){
			
			cout << "No";
			exit(0);
		}
	}
	cout << "Yes";
}