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>
#define NO {cout<<"No"; return 0;}
using namespace std;
int a, b;
string s;
int main() {
	int i;
	cin>>a>>b>>s;
	if(s.size()!=a+b+1) NO;
	for(i=0; i<a; i++) if(s[i]=='-') NO;
	if(s[a]!='-') NO;
	for(i=a+1; i<a+b+1; i++) if(s[i]=='-') NO;
	cout<<"Yes";
	return 0;
}