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
# -*- coding: utf-8 -*-
a, b = map(int, raw_input().split())
s = raw_input()
ok = False
if len(s) == (a+b+1):
  n = s.count('-')
  if n == 1:
    x,y = map(str, s.split('-'))
    if len(x) == a:
      if len(y) == b:
        ok = True

if ok:
  print 'Yes'
else:
  print 'No'