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>

int main() {
  int a, b, i, n;
  char s[12];
  scanf("%d %d", &a, &b);
  scanf("%s", &s);
  
  if (strlen(s) != a + b + 1) {
    printf("No\n");
    return 0;
  }
  
  if (s[a] != '-') {
    printf("No\n");
    return 0;
  }
  
  for (i = 0; i < a; ++ i) {
    n = s[i] - '0';
    if (n < 0 || n > 9)  {
      printf("No\n");
      return 0;
    }
  }
  
  for (i = a + 1; i < a + b + 1; ++ i) {
    n = s[i] - '0';
    if (n < 0 || n > 9)  {
      printf("No\n");
      return 0;
    }
  }
  printf("Yes\n");
  return 0;
}