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 <stdio.h>
int main(void){
  int a,b,i;
  char s[15];
  scanf("%d%d\n%s",&a,&b,s);
  if (s[a]!='-'){
    printf("No\n");
    return 0;
  }
  s[a]='0';
  for (i=0;s[i];i++){
    if ((int)s[i]<48||(int)s[i]>57){
      printf("No\n");
      return 0;
    }
  }
  printf("Yes\n");
  return 0;
}