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.

Examples

Input

3 4
269-6650


Output

Yes


Input

1 1
---


Output

No


Input

1 2
7444


Output

No
#include<bits/stdc++.h>

using namespace std;
string s;
int a,b,ans;
int main()
{
	cin>>a>>b;
	cin>>s;
    for(int i=0;i<s.size();i++)
	{
	   if(i!=a)
	   {
	   	  if(s[i]>='0' && s[i]<='9') ans++;
	   }
	}
	if(ans==a+b && s[a]=='-') cout<<"Yes";
	else cout<<"No";
	cout<<endl;
	return 0;
}