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>
#include<string.h>
using namespace std;
int main()
{
int A,B,i,j=0;
string s;
cin>>A>>B>>s;
for(i=0;i<s.length();i++)
{
if(s[i]!='-')
{if(j==0)
A--;
else
B--;
}
else
j=1;
}
if(A==0&&B==0)
cout<<"Yes";
else
cout<<"No";
return 0;
}