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 9.2.1) (judge verdict: Accepted)

#include <stdio.h>
//30-39
int  main()
{
    int a, b, valid = 0, counter = 0;
    scanf("%d %d", &a, &b);
    char str[a+b+1];
    scanf("%s", str);

    for (int i = 0; i < a + b; i++)
    {
        if ((30 <= str[i] && str[i]<=  39)  || (str[a] == '-'))
        {
            if (str[i] == '-')
            {
                counter++;
            }
            
            valid = 1;
        }
        else
        {
            break;
        }
    }
    
    if (valid == 1 && counter == 1)
    {
        printf("Yes\n");
    }
    else
    {
        printf("No\n");
    }
    

    return 0;
}