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>
int main(){int f=1,b,a;char s[12];scanf("%d%d%s",&a,&b,s);for(b+=a+1;b--;)if(b==a&&s[b]!='-'||b-a&&(s[b]<'0'||s[b]>'9'))f=0;return !printf("%s",f?"Yes":"No");}