using System;

namespace ReadWrite
{
    class FileWriter
    {
        static void ReadWriteFile(string inFile, string outFile, string comparer)
        {
            string line;

            using (System.IO.StreamReader reader = new System.IO.StreamReader(inFile))
            using (System.IO.StreamWriter writer = new System.IO.StreamWriter(outFile))
            {
                while ((line = reader.ReadLine()) != null)
                {
                    if (line.Contains(comparer))
                    {
                        writer.WriteLine(line);
                    }
                }
            }
        }

        static void Main(string[] args)
        {
            string inFile = args[0];
            string outFile = args[1];
            string comparer = args[2];
            if (String.IsNullOrEmpty(inFile) || String.IsNullOrEmpty(outFile) || String.IsNullOrEmpty(comparer))
                throw new ArgumentException("Parametrii sunt incorecți");
            ReadWriteFile(inFile, outFile, comparer);
        }
    }
}