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
#abc084b
import sys

a,b=map(int,raw_input().split())
s=raw_input()
if s[a] != '-':
 print 'No'
 sys.exit()
for i in xrange(a):
 if s[i].isdigit()==False:
  print 'No'
  sys.exit()
for i in xrange(a+1,a+1+b):
 if s[i].isdigit()==False:
  print 'No'
  sys.exit()
print 'Yes'
