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() {
  int A, B, pos = 0;
  char S[20];
  scanf("%d %d %s", &A, &B, S);
  for (int i = 0; S[i] != '\0'; i++) {
    (S[i] == '-') ? pos += i + 1 : pos += 0;
  }
  pos == A + 1 ? puts("Yes") : puts("No");
  return 0;
}
