Problem:
Score : 200 points

Problem Statement

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.

Sample Input 1

3 4
269-6650

Sample Output 1

Yes

The (A+1)-th character of S is -, and the other characters are digits from 0 through 9, so it follows the format.

Sample Input 2

1 1
---

Sample Output 2

No

S contains unnecessary -s other than the (A+1)-th character, so it does not follow the format.

Sample Input 3

1 2
7444

Sample Output 3

No

Solution in C (GCC 5.4.1) (judge verdict: Accepted)

#include <stdio.h>
int main(void){
    int a,b,ans=0 ;
    char s[15] ;
    scanf ("%d%d%s",&a,&b,s) ;
    
    for (int i=0; i<a; i++ ){
        if ( s[i]!='-' ){
            ans++ ;
        }
    }
    
    if ( s[a]=='-' ){
        ans++ ;
    }
    
    for (int i=0; i<b; i++ ){
        if ( s[a+1+i]!='-' ){
            ans++ ;
        }
    }
    
    if ( ans==a+b+1 ){
        printf ("Yes\n") ;
    } else {
        printf ("No\n") ;
    }
    
    return 0 ;
    
}