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 a,b,sum;char s[20];
int main(){
	cin>>a>>b>>s;
	if(s[a]!='-'){ cout<<"No";return 0;}
	for(int i=0;i<=a+b;i++){
		if(s[i]<'0'||s[i]>'9') sum++;
		if(sum>1) break;
	}
	if(sum>1) cout<<"No";
	else cout<<"Yes";
	return 0;
}