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 main()
{
	int a,b,f=0;
	char x[100];
	cin>>a>>b>>x;
	for(int i=0;i<a;i++)if(x[i]<'0'||x[i]>'9')f=1;
	if(x[a]!='-')f=1;
	for(int i=a+1;i<a+b+1;i++)if(x[i]<'0'||x[i]>'9')f=1;
	if(x[a+b+1]!='\0'||f)cout << "No\n";
	else cout << "Yes\n";
	
}