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 -*-

import sys

a, b = [int(e) for e in raw_input().split()]
s = raw_input().split()[0]

sa = s[:a]
sh = s[a:a+1]
sb = s[a+1:]

if len(sa) == a:
    if  sa.isdigit():
        if sh == '-':
            if len(sb) == b:
                if sb.isdigit():
                    sys.stdout.write('Yes\n')
                    sys.stdout.flush()
                    sys.exit(0)

sys.stdout.write('No\n')
sys.stdout.flush()
