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 (Clang 10.0.0) (judge verdict: Accepted)

#include <stdio.h>
 
int main()
{
    int a,b,i,sum=0;
    scanf("%d %d",&a,&b);
    char s[a+b+1];
    scanf("%s",s);
    for(i=0;i<a+b+1;i++){
        if(i!=a){
            if(s[i]>='0' && s[i]<='9')
            {sum++;}
        } else if(s[i]=='-')
        {sum++;}
    }
    (sum==a+b+1)? printf("Yes\n"): printf("No\n");
    return 0;
}