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: Wrong Answer)

#include<stdio.h>
#include<ctype.h>

int main(){
  int a,b,i=0,check=0;
  char moji[12];
  
  scanf("%d",&a);
  scanf("%d",&b);
  scanf("%s",moji);

  for(i=0;i<a;i++)
    if(isdigit(moji[i])==1)
      check++;
  if(moji[a]=='-')check++;
  for(i=a+1;i<a+b+1;i++)
   	if(isdigit(moji[i])==1)
      check++; 
  
  if(check==a+b+1)
    printf("Yes");
  else printf("No");
              
  return 0;
}