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;
int main(){
	char s;
	int i,j,k=0,n,a,b;
	cin>>a>>b;
	for(i=1;i<=a+b+1;i++){
		cin>>s;
		if(k==0){
			if(i!=a+1){
				if(s<'0'||s>'9')k=1;
			}
			else{
				if(s!='-')k=1;
			}
		}
	}
	if(k==1)cout<<"No"<<endl;
	else cout<<"Yes"<<endl;
	return 0;
}