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>

#define ll long long 
#define sz(x) (int)x.size()

using namespace std;

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


	
	
}