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: Accepted)

using System;
using static System.Console;

namespace ABC84
{
    class Program
    {
        static void Main(string[] args) {
            string Id = ReadLine();
            string[] Idsa = Id.Split(' ');
            string HanS = ReadLine();
            string[] Hana = HanS.Split('-');
            bool fl = true;
            if (Hana.Length != 2) {
                fl = false;
            }
            if (( Hana[0].Length == Int32.Parse(Idsa[0]) ) && ( Hana[1].Length == Int32.Parse(Idsa[1]) )) {

            } else {
                fl = false;
            }
            if (fl == true) {
                WriteLine("Yes");
            } else {
                WriteLine("No");
            }
        }
    }
}