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<stdio.h>
int main(){
int a,b,i,yj=0,x;
char s[12];
scanf("%d %d",&a,&b);
scanf("%s",s);
for(i=0;i<a;i++){
x=s[i]-'0';
if(x<0||9<x)yj++;
}
if(s[a]!='-')yj++;
for(i=a+1;i<a+b+1;i++){
x=s[i]-'0';
if(x<0||9<x)yj++;
}
if(yj==0)printf("Yes");
else printf("No");
return 0;
}