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;
using System.Linq;
using System.Collections.Generic;
namespace Solution
{
    class Solution
    {
        static void Main(string[] args)
        {
            int[] x = System.Console.ReadLine().Trim().Split(' ').Select(z => int.Parse(z)).ToArray();
            try
            {
                string[] input = System.Console.ReadLine().Split('-');
                int a = int.Parse(input[0]);
                int b = int.Parse(input[1]);
                if (a.ToString().Length == x[0] && b.ToString().Length == x[1]) System.Console.WriteLine("Yes");
                else System.Console.WriteLine("No");
            }
            catch
            {
                System.Console.WriteLine("No");
            }
        }
    }
}