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
import sys
a, b = map(int, raw_input().split())
s = raw_input()
num = [str(i) for i in xrange(10)]
for i in xrange(a):
    if not s[i] in num:
        print "No"
        sys.exit()

if not s[i+1] == "-":
    print "No"
    sys.exit()

for i in xrange(b):
    if not s[i+a+1] in num:
        print "No"
        sys.exit()

print "Yes"
