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
l = map(int, raw_input().split())
k = raw_input()
listed = list(k)
if (len(k) == (l[0] + l[1] + 1)) and (listed[l[0]] == "-"):
    if (str("".join(listed[0:l[0]])).isdigit() == True) and (str("".join(listed[l[0]+1:len(listed)])).isdigit() == True):
        print "Yes"
        exit()
    print "No"
else:
    print "No"
