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;
int main()
{
	int a,b,bj;
	string s;
	cin>>a>>b;
	cin>>s;
	if(s[a]!='-'){cout<<"No"<<endl;return 0;}
	for(int i=0;i<a+b+1;i++)
	{
		if(s[i]<48||s[i]>57)bj++;
		if(bj>=2){cout<<"No"<<endl;return 0;}
	}
	cout<<"Yes"<<endl;
	return 0;
}