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>

int main()
{
 long int n,n2,flag=0,i,j;
  char a[11];
  scanf("%ld%ld\n",&n,&n2);
 for(i=0;i<=n+n2;i++)
 {
     scanf("%c",&a[i]);
 }

 for(i=0,j=n+1;i<n-1 || j<n+n2;i++,j++)
 {
     if(a[i]<48|| a[i]>58 || a[j]<48|| a[j]>58)
     {
         flag=1;
         break;
     }

 }
 
 
 
 if(flag==1 || a[n]!='-')
 {
     printf("No");
 }else{
     printf("Yes");
 }
    return 0;
}