using System;

using System.Collections.Generic;

public class Program

{

    private List<Func<string, bool>> validationRules = new List<Func<string, bool>>();

    public void AddValidationRule(Func<string, bool> validationFunction)

    {

        validationRules.Add(validationFunction);

    }

    public void RemoveValidationRule(Func<string, bool> validationFunction)

    {

        validationRules.Remove(validationFunction);

    }

    public bool Validate(string validationString)

    {

        return validationRules.TrueForAll(f => f(validationString));

    }

    public bool RandomFunction(string s)

    {

        Console.WriteLine("Random");

        return true;

    }

    public void Main()

    {

        AddValidationRule( RandomFunction );

        AddValidationRule( (Func<string, bool>)delegate(string s) { return (s.Length % 2) == 0; } );

        AddValidationRule( (Func<string, bool>)delegate(string s) { return s.Length > 2; } );

        AddValidationRule( (Func<string, bool>)delegate(string s) { return s[0] == 'A'; } );

        Console.WriteLine(Validate("Anus"));

        Console.WriteLine(Validate("Anuss"));

        RemoveValidationRule( (Func<string, bool>)delegate(string s) { return (s.Length % 2) == 0; } );

        RemoveValidationRule( RandomFunction );

        Console.WriteLine(Validate("Anuss"));

    }

}