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()
flg = True

for i in range(0,a):
    if(not('0'<=s[i] and s[i]<='9')):flg = False
if(s[a] != '-'):flg = False
for i in range(a+1,a+b+1):
    if(not('0'<=s[i] and s[i]<='9')):flg = False
print('Yes' if flg else 'No')