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 <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp> 
#include <ext/pb_ds/tree_policy.hpp>

#include <ext/rope> //header with rope
using namespace std;
using namespace __gnu_cxx; //namespace with rope and some additional stuff
using namespace __gnu_pbds;

#define rep(i, a, b) for(int i=a; i<b; i++)
#define pb push_back
#define mp make_pair
#define F first
#define S second

typedef long long int ll;
typedef unsigned long long int ull;
typedef pair <int, int> ii;

const ll mod = 1000000007;
const int INF = 0x3f3f3f3f;




int main(){
		
	int a, b; cin >> a >> b; 
	string s; getline(cin, s);
	getline(cin, s);
	
	if(s.size()==a+b+1 && s[a]=='-'){
		rep(i, 0, s.size()){
			if(i==a || (s[i]>='0' && s[i]<='9')) continue;
			puts("No");
			return 0;
		}
	}else{
		puts("No");
	}
	
	puts("Yes");

	
	return 0;
	
}