Just a quick note on how to read from a file with stdin.

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// program.cs

using System;
   
   namespace EchoAndSize
   {
       class Program
       {
           static void Main(string[] args)
           {
               String line = Console.ReadLine();
               Console.WriteLine(line);
           }
       }
       class Program2
       {
   
       }
   }

In command line: