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<string.h>

int main(){
  int i,j,k;
  int A,B;
  
  scanf("%d %d",&A,&B);
  
  char S[A+B+1];
  scanf("%s",S);
  
  if(strlen(S)!=A+B+1 || S[A] !='-'){
    puts("No");
    return 0;
  }
  
  for(i=0;i<A;i++){
    k = S[i]-'0';
    if(!(k>=0&&k<=9)){
      puts("No");
      return 0;
    }
  }
  
  for(i=A+B;i!=A+2;i--){
    k = S[i]-'0';
    if(!(k>=0&&k<=9)){
      puts("No");
      return 0;
    }
  }
  
  puts("Yes");
  return 0;
}