using System;

public class Program

{

    public static void Main()

    {

    var charToPrint = 'x';

    var rows = 5;

    var columns = 4;

    for (var i = 0; i < rows; i++)

    {

       for (var j = 0; j < columns; j++)

          Console.Write(charToPrint); // writes character at a time for each column

       Console.WriteLine();  // write a new line for end of row

    }

    }

}