Text Filter

using System;
using System.Linq;

class TextFilter
{
    static void Main()
    {
        string[] filter = Console.ReadLine().Split(new char[] { ',', ' ' }, StringSplitOptions.RemoveEmptyEntries);
        string text = Console.ReadLine();

        text = filter.Aggregate(text, (current, word) => current.Replace(word, new string('*', word.Length)));

        Console.WriteLine(text);
    }
}