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<cstdio>
char s[20];
int main(){
    int a,b,i,ok=1;
    scanf("%d%d",&a,&b);
    scanf("%s",s);
    for(i=0;i<a;i++)if(s[i]<'0'||s[i]>'9')ok=0;
    if(s[a]!='-')ok=0;
    for(i=a+1;i<=a+b;i++)if(s[i]<'0'||s[i]>'9')ok=0;
    printf("%s\n",ok?"Yes":"No");
    return 0;
}