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()

flag = False
if S[A] == '-':
    Ss = S.split('-')
    if len(Ss) == 2:
        if len(Ss[0]) == A and len(Ss[1]) == B:
            if Ss[0].isdigit() and Ss[1].isdigit():
                flag = True

if flag:
    print 'Yes'
else:
    print 'No'