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<bits/stdc++.h>
using namespace std;
int a,b,k;
string str;
int main()
{
    cin>>a>>b>>str;
    for(int i=0;i<=a+b;i++)
	{
        if(isdigit(str[i])) continue;
		else if(i != a) { k = 1; break; }
    }
    if(str[a]!='-') k = 1;
    if(k) cout<<"No\n";
    else cout<<"Yes\n";
    return 0;
}