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++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include<cstdio>
using namespace std;
int main(){
  int a, b; scanf("%d%d",&a,&b);
  char s[12]; scanf("%s", &s);
  for(int i = 0; i < a; i++){
    if(!('0' <= s[i] && s[i] <= '9')) puts("No");
  }

  if(s[a] != '-') puts("No");
  for(int j = a+1; j <= a+b; j++) if(!('0' <= s[j] && s[j] <= '9'))
  {
    puts("No");
  }
  puts("Yes");  
}