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 n,a,b,c,i,j,d;
string s;
int main()
{
  cin>>a>>b>>s;
  if(s[a]!='-')return cout<<"No"<<endl,0;
  for(;i<a;i++)if(s[i]=='-')return cout<<"No"<<endl,0;
  for(i=s.size()-b;i<s.size();i++)if(s[i]=='-')return cout<<"No"<<endl,0;
  cout<<"Yes"<<endl;
}