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
#include <iostream>
using namespace std;
int a, b, i, j;
string s;
int main() {
	cin>>a>>b>>s;
	for(i=0; s[i] && s[i]!='-'; i++);
	for(j=i+1; s[j] && s[j]!='-'; j++);
	cout<<(s[j]=='\0' && i==a && j-i-1==b ? "Yes":"No");
	return 0;
}