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<cstdio>
#include<iostream>
#include<cstring>
#include<cstdlib>
#include<iomanip>
#include<utility>
#include<vector>
#include<queue>
#include<algorithm>
#include<set>
#include<map>
#include<string>
#include<cctype>
#include<cmath>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<char> vc;
typedef vector<ll> vl;
typedef queue<int> qi;
typedef queue<ll> ql;
typedef pair<ll,ll> pll;
typedef pair<int,ll> pil;
typedef pair<ll,int> pli;
#define pq priority_queue
#define rep(i,n) for (int i=0;i<n;i++)
#define mp make_pair
#define pb push_back
#define pf push_front
#define F first
#define S second
#define INF 200000009
#define init(x) memset(x,0,sizeof(x))
int a,b; 
string s;
int main()
{
    ios::sync_with_stdio(false);
    cin>>a>>b;
    cin>>s;
    for (int i=0;i<s.size();++i){
    	if (i<a){
    		if (s[i]=='-'){
    			cout<<"No";
    			return 0;
			}
			continue;
		}
		else if (i==a){
			if (s[i]!='-'){
				cout<<"No";
				return 0;
			}
		}
		else{
			if (s[i]=='-'){
				cout<<"No";
				return 0;
			}
		}
	}
	cout<<"Yes";
    return 0; 
}