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(int argc, char const *argv[]) {
  int a,b,s,n,i;

  char S[100];

  scanf("%d%d%s",&a,&b,&S);

  for (i=0;S[i]!='\0'; i++) {
    if (a+b==i) {
      n=S[a];
      if (n=='-') {
        printf("Yes\n");
      }
      else {
      printf("No\n");
    }
  }
    }
/*  for (i=0;S[i]!='\0'; ++i) {
    if (a+b==i) {
      n = S[a+1];
      if (n=='-') {
        printf("Yes\n");
      }
    else{
      printf("No\n");
    }
    }
  }
*/
  return 0;
}