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 <iostream>
using namespace std;
string st;
int a,b,w;
int main()
{
	cin>>a>>b;
	cin>>st;
	for (int i=0;i<st.size();i++)
	{
		if (i!=a)
		{
			if (st[i]<'0' || st[i]>'9') 
			{
				w=1;
				break;
			}
		}
	}
	if (w==1 || st[a]!='-') cout<<"No"<<endl;
	else cout<<"Yes"<<endl;
}