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>
#include<stdbool.h>

int main()
{
  int a,b;
  
  scanf("%d%d",&a,&b);
  
  char s[a+b+1];
  
  scanf("%s",s);
  
  int i;
  bool flag=true;
  
  if(s[a]!='-')
  {
    flag=false;
  }
  
  if(s[a]=='-')
  {
    for(i=0;i<a+b+1;i++)
    {
      if(i!=a)
      {
        if('0'>s[i]||s[i]>'9')
        {
          flag=false;
        }
      }
    }
  }
  
  if(flag==true)
  {
    printf("Yes\n");
  }
  else
  {
    printf("No\n");
  }
  
  return 0;
}