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 System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace B {
    class Program {
        static void Main(string[] args) {
            var zip = Console.ReadLine().Split();
            var A = int.Parse( zip[ 0 ] );
            var B = int.Parse( zip[ 1 ] );
            var S = Console.ReadLine();
            var doesMeet = true;
            if (S.Length != A + B + 1) doesMeet = false;
            else if (S.Where( x => x == '-' ).Count() != 1) doesMeet = false;
            else if (S.Split( '-' )[ 0 ].Length != A) doesMeet = false;
            else if (S.Split( '-' )[ 1 ].Length != B) doesMeet = false;
            Console.WriteLine( doesMeet ? "Yes" : "No" );
        }
    }
}