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
# vim: set fileencoding=utf-8:


def main():
    A, B = map(int, raw_input().split())
    S = raw_input()

    if len(S) == A + B + 1 and S[A] == "-" and S[0:A].isalnum() and S[A + 1:].isalnum():
        print("Yes")
    else:
        print("No")


if __name__ == "__main__":
    main()
