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# (Mono 4.6.2.0) (judge verdict: Wrong Answer)

using System;


class Program
{
    static void Main(string[] args)
    {
        String[] tmp = Console.ReadLine().Split(' ');
        
        

        try
        {
            int A = int.Parse(tmp[0]);
            int B = int.Parse(tmp[1]);
            String[] S = Console.ReadLine().Split('-');
            String S_a = S[0];
            String S_b = S[1];
            int check = int.Parse(S_a);
            check = int.Parse(S_b);
            Console.WriteLine("Yes");
            
        }catch(Exception e)
        {
            Console.WriteLine("No");
        }
        //System.Threading.Thread.Sleep(5000);
    }
}