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
#!/usr/bin/python

import re
import sys

def main(argv):
    line = sys.stdin.readline()
    while line:
        A, B = map(lambda x: int(x), line.rstrip("\n").split(" "))
        S = sys.stdin.readline().rstrip("\n")
        pattern = "\d{{{0}}}-\d{{{1}}}$".format(A, B)
        if re.match(pattern, S):
            print "Yes"
        else:
            print "No"

        line = sys.stdin.readline()

if __name__ == "__main__":
    main(sys.argv)