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>
int main(){
  int a,b,r=1;
  char c[12]={};
  std::cin>>a>>b>>c;
  for(int i=0;i<a+b+1;++i){
    if(i==a){r=(c[i]=='-'?r:0);}
    else{r=(c[i]>47&&c[i]<58?r:0);}
  }
  std::cout<<(r?"Yes":"No")<<"\n";
}