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<algorithm>
#include<cmath>
#include<math.h>
#include<iomanip>
#include<string>
#include<vector>
#include<set>
#include<map>
#include<utility>
#include<stack>
#include<queue>
#include<sstream>
#include<bitset>
#include<cstdio>
using namespace std;
void fast()
{
	std::ios_base::sync_with_stdio(0);
	cin.tie(0);cout.tie(0);
}
int main()
{
	//in_out_txt();
	fast();
	int a,b;
	cin>>a>>b;
	bool ok=true;
	string str;
	cin>>str;
	if(str[a]!='-')
		ok=false;
	for(int i=0;i<str.size();i++)
	{
		if(i==a)
			continue;
		if(str[i]<'0' || str[i]>'9')
			ok=false;
	}
	if(ok)
		cout<<"Yes"<<endl;
	else
		cout<<"No"<<endl;
	return 0;
}