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;cin>>a>>b;
  string s;
  cin>>s;
  int cnt=0;
  for(int i=0;i<a+b+1;i++){
  if(i==a){
  cnt+=(s[i]=='-');}
  else{
  for(char c='0';c<='9';c++)cnt+=(s[i]==c);}}
  cout<<(cnt==a+b+1?"Yes":"No");
}
